mirror of
https://github.com/jashkenas/coffeescript.git
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9b77371ea8
# Conflicts: # Cakefile # docs/v1/index.html # documentation/sections/changelog.md # documentation/sections/installation.md # documentation/sections/introduction.md # lib/coffee-script/nodes.js # lib/coffee-script/rewriter.js # lib/coffee-script/sourcemap.js # lib/coffeescript/browser.js # lib/coffeescript/cake.js # lib/coffeescript/coffeescript.js # lib/coffeescript/command.js # lib/coffeescript/grammar.js # lib/coffeescript/helpers.js # lib/coffeescript/index.js # lib/coffeescript/lexer.js # lib/coffeescript/optparse.js # lib/coffeescript/register.js # lib/coffeescript/repl.js # lib/coffeescript/scope.js # package.json
882 lines
18 KiB
CoffeeScript
882 lines
18 KiB
CoffeeScript
# Modules, a.k.a. ES2015 import/export
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# ------------------------------------
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#
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# Remember, we’re not *resolving* modules, just outputting valid ES2015 syntax.
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# This is the CoffeeScript import and export syntax, closely modeled after the ES2015 syntax
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# https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import
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# https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/export
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# import "module-name"
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# import defaultMember from "module-name"
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# import * as name from "module-name"
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# import { } from "module-name"
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# import { member } from "module-name"
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# import { member as alias } from "module-name"
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# import { member1, member2 as alias2, … } from "module-name"
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# import defaultMember, * as name from "module-name"
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# import defaultMember, { … } from "module-name"
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# export default expression
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# export class name
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# export { }
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# export { name }
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# export { name as exportedName }
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# export { name as default }
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# export { name1, name2 as exportedName2, name3 as default, … }
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#
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# export * from "module-name"
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# export { … } from "module-name"
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#
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# As a subsitute for `export var name = …` and `export function name {}`,
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# CoffeeScript also supports:
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# export name = …
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# CoffeeScript also supports optional commas within `{ … }`.
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# Helper function
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toJS = (str) ->
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CoffeeScript.compile str, bare: yes
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.replace /^\s+|\s+$/g, '' # Trim leading/trailing whitespace
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# Import statements
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test "backticked import statement", ->
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input = """
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if Meteor.isServer
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`import { foo, bar as baz } from 'lib'`"""
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output = """
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if (Meteor.isServer) {
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import { foo, bar as baz } from 'lib';
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}"""
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eq toJS(input), output
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test "import an entire module for side effects only, without importing any bindings", ->
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input = "import 'lib'"
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output = "import 'lib';"
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eq toJS(input), output
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test "import default member from module, adding the member to the current scope", ->
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input = """
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import foo from 'lib'
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foo.fooMethod()"""
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output = """
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import foo from 'lib';
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foo.fooMethod();"""
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eq toJS(input), output
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test "import an entire module's contents as an alias, adding the alias to the current scope", ->
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input = """
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import * as foo from 'lib'
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foo.fooMethod()"""
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output = """
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import * as foo from 'lib';
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foo.fooMethod();"""
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eq toJS(input), output
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test "import empty object", ->
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input = "import { } from 'lib'"
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output = "import {} from 'lib';"
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eq toJS(input), output
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test "import empty object", ->
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input = "import {} from 'lib'"
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output = "import {} from 'lib';"
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eq toJS(input), output
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test "import a single member of a module, adding the member to the current scope", ->
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input = """
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import { foo } from 'lib'
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foo.fooMethod()"""
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output = """
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import {
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foo
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} from 'lib';
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foo.fooMethod();"""
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eq toJS(input), output
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test "import a single member of a module as an alias, adding the alias to the current scope", ->
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input = """
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import { foo as bar } from 'lib'
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bar.barMethod()"""
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output = """
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import {
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foo as bar
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} from 'lib';
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bar.barMethod();"""
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eq toJS(input), output
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test "import multiple members of a module, adding the members to the current scope", ->
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input = """
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import { foo, bar } from 'lib'
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foo.fooMethod()
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bar.barMethod()"""
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output = """
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import {
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foo,
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bar
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} from 'lib';
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foo.fooMethod();
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bar.barMethod();"""
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eq toJS(input), output
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test "import multiple members of a module where some are aliased, adding the members or aliases to the current scope", ->
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input = """
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import { foo, bar as baz } from 'lib'
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foo.fooMethod()
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baz.bazMethod()"""
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output = """
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import {
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foo,
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bar as baz
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} from 'lib';
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foo.fooMethod();
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baz.bazMethod();"""
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eq toJS(input), output
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test "import default member and other members of a module, adding the members to the current scope", ->
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input = """
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import foo, { bar, baz as qux } from 'lib'
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foo.fooMethod()
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bar.barMethod()
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qux.quxMethod()"""
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output = """
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import foo, {
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bar,
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baz as qux
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} from 'lib';
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foo.fooMethod();
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bar.barMethod();
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qux.quxMethod();"""
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eq toJS(input), output
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test "import default member from a module as well as the entire module's contents as an alias, adding the member and alias to the current scope", ->
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input = """
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import foo, * as bar from 'lib'
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foo.fooMethod()
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bar.barMethod()"""
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output = """
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import foo, * as bar from 'lib';
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foo.fooMethod();
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bar.barMethod();"""
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eq toJS(input), output
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test "multiline simple import", ->
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input = """
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import {
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foo,
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bar as baz
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} from 'lib'"""
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output = """
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import {
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foo,
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bar as baz
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} from 'lib';"""
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eq toJS(input), output
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test "multiline complex import", ->
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input = """
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import foo, {
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bar,
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baz as qux
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} from 'lib'"""
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output = """
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import foo, {
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bar,
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baz as qux
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} from 'lib';"""
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eq toJS(input), output
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test "import with optional commas", ->
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input = "import { foo, bar, } from 'lib'"
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output = """
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import {
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foo,
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bar
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} from 'lib';"""
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eq toJS(input), output
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test "multiline import without commas", ->
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input = """
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import {
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foo
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bar
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} from 'lib'"""
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output = """
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import {
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foo,
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bar
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} from 'lib';"""
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eq toJS(input), output
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test "multiline import with optional commas", ->
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input = """
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import {
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foo,
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bar,
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} from 'lib'"""
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output = """
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import {
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foo,
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bar
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} from 'lib';"""
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eq toJS(input), output
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test "a variable can be assigned after an import", ->
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input = """
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import { foo } from 'lib'
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bar = 5"""
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output = """
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var bar;
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import {
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foo
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} from 'lib';
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bar = 5;"""
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eq toJS(input), output
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test "variables can be assigned before and after an import", ->
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input = """
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foo = 5
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import { bar } from 'lib'
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baz = 7"""
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output = """
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var baz, foo;
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foo = 5;
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import {
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bar
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} from 'lib';
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baz = 7;"""
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eq toJS(input), output
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# Export statements
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test "export empty object", ->
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input = "export { }"
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output = "export {};"
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eq toJS(input), output
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test "export empty object", ->
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input = "export {}"
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output = "export {};"
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eq toJS(input), output
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test "export named members within an object", ->
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input = "export { foo, bar }"
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output = """
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export {
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foo,
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bar
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};"""
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eq toJS(input), output
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test "export named members as aliases, within an object", ->
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input = "export { foo as bar, baz as qux }"
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output = """
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export {
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foo as bar,
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baz as qux
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};"""
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eq toJS(input), output
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test "export named members within an object, with an optional comma", ->
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input = "export { foo, bar, }"
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output = """
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export {
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foo,
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bar
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};"""
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eq toJS(input), output
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test "multiline export named members within an object", ->
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input = """
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export {
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foo,
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bar
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}"""
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output = """
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export {
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foo,
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bar
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};"""
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eq toJS(input), output
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test "multiline export named members within an object, with an optional comma", ->
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input = """
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export {
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foo,
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bar,
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}"""
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output = """
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export {
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foo,
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bar
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};"""
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eq toJS(input), output
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test "export default string", ->
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input = "export default 'foo'"
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output = "export default 'foo';"
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eq toJS(input), output
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test "export default number", ->
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input = "export default 5"
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output = "export default 5;"
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eq toJS(input), output
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test "export default object", ->
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input = "export default { foo: 'bar', baz: 'qux' }"
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output = """
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export default {
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foo: 'bar',
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baz: 'qux'
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};"""
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eq toJS(input), output
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test "export default assignment expression", ->
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input = "export default foo = 'bar'"
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output = """
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var foo;
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export default foo = 'bar';"""
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eq toJS(input), output
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test "export assignment expression", ->
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input = "export foo = 'bar'"
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output = "export var foo = 'bar';"
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eq toJS(input), output
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test "export multiline assignment expression", ->
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input = """
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export foo =
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'bar'"""
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output = "export var foo = 'bar';"
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eq toJS(input), output
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test "export multiline indented assignment expression", ->
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input = """
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export foo =
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'bar'"""
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output = "export var foo = 'bar';"
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eq toJS(input), output
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test "export default function", ->
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input = "export default ->"
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output = "export default function() {};"
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eq toJS(input), output
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test "export default multiline function", ->
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input = """
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export default (foo) ->
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console.log foo"""
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output = """
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export default function(foo) {
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return console.log(foo);
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};"""
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eq toJS(input), output
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test "export assignment function", ->
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input = """
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export foo = (bar) ->
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console.log bar"""
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output = """
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export var foo = function(bar) {
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return console.log(bar);
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};"""
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eq toJS(input), output
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test "export assignment function which contains assignments in its body", ->
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input = """
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export foo = (bar) ->
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baz = '!'
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console.log bar + baz"""
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output = """
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export var foo = function(bar) {
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var baz;
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baz = '!';
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return console.log(bar + baz);
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};"""
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eq toJS(input), output
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test "export default predefined function", ->
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input = """
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foo = (bar) ->
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console.log bar
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export default foo"""
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output = """
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var foo;
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foo = function(bar) {
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return console.log(bar);
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};
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export default foo;"""
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eq toJS(input), output
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# Uncomment this test once ES2015+ `class` support is added
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# test "export default class", ->
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# input = """
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# export default class foo extends bar
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# baz: ->
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# console.log 'hello, world!'"""
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# output = """
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# export default class foo extends bar {
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# baz: function {
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# return console.log('hello, world!');
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# }
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# }"""
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# eq toJS(input), output
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# Very limited tests for now, testing that `export class foo` either compiles
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# identically (ES2015+) or at least into some function, leaving the specifics
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# vague in case the CoffeeScript `class` interpretation changes
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test "export class", ->
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input = """
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export class foo
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baz: ->
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console.log 'hello, world!'"""
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output = toJS input
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ok /^export (var foo = class foo|var foo = \(function)/.test toJS input
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test "export class that extends", ->
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input = """
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export class foo extends bar
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baz: ->
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console.log 'hello, world!'"""
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output = toJS input
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ok /export var foo = class foo/.test(output) and \
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not /var foo(;|,)/.test output
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test "export default class that extends", ->
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input = """
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export default class foo extends bar
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baz: ->
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console.log 'hello, world!'"""
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ok /export default foo = class foo/.test toJS input
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test "export default named member, within an object", ->
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input = "export { foo as default, bar }"
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output = """
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export {
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foo as default,
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bar
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};"""
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eq toJS(input), output
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# Import and export in the same statement
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test "export an entire module's contents", ->
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input = "export * from 'lib'"
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output = "export * from 'lib';"
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eq toJS(input), output
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test "export members imported from another module", ->
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input = "export { foo, bar } from 'lib'"
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output = """
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export {
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foo,
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bar
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} from 'lib';"""
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eq toJS(input), output
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test "export as aliases members imported from another module", ->
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input = "export { foo as bar, baz as qux } from 'lib'"
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output = """
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export {
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foo as bar,
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baz as qux
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} from 'lib';"""
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eq toJS(input), output
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test "export list can contain CoffeeScript keywords", ->
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input = "export { unless } from 'lib'"
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output = """
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export {
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unless
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} from 'lib';"""
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eq toJS(input), output
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test "export list can contain CoffeeScript keywords when aliasing", ->
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input = "export { when as bar, baz as unless } from 'lib'"
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output = """
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export {
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when as bar,
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baz as unless
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} from 'lib';"""
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eq toJS(input), output
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# Edge cases
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test "multiline import with comments", ->
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input = """
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import {
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foo, # Not as good as bar
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bar as baz # I prefer qux
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} from 'lib'"""
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output = """
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import {
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foo,
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bar as baz
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} from 'lib';"""
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eq toJS(input), output
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test "`from` not part of an import or export statement can still be assigned", ->
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from = 5
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eq 5, from
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test "a variable named `from` can be assigned after an import", ->
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input = """
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import { foo } from 'lib'
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from = 5"""
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output = """
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var from;
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import {
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foo
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} from 'lib';
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from = 5;"""
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eq toJS(input), output
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test "`from` can be assigned after a multiline import", ->
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input = """
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import {
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foo
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} from 'lib'
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from = 5"""
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||
output = """
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var from;
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import {
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foo
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} from 'lib';
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from = 5;"""
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eq toJS(input), output
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test "`from` can be imported as a member name", ->
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input = "import { from } from 'lib'"
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output = """
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import {
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from
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} from 'lib';"""
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eq toJS(input), output
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test "`from` can be imported as a member name and aliased", ->
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input = "import { from as foo } from 'lib'"
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output = """
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import {
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from as foo
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} from 'lib';"""
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eq toJS(input), output
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|
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test "`from` can be used as an alias name", ->
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input = "import { foo as from } from 'lib'"
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output = """
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import {
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foo as from
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} from 'lib';"""
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eq toJS(input), output
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test "`as` can be imported as a member name", ->
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input = "import { as } from 'lib'"
|
||
output = """
|
||
import {
|
||
as
|
||
} from 'lib';"""
|
||
eq toJS(input), output
|
||
|
||
test "`as` can be imported as a member name and aliased", ->
|
||
input = "import { as as foo } from 'lib'"
|
||
output = """
|
||
import {
|
||
as as foo
|
||
} from 'lib';"""
|
||
eq toJS(input), output
|
||
|
||
test "`as` can be used as an alias name", ->
|
||
input = "import { foo as as } from 'lib'"
|
||
output = """
|
||
import {
|
||
foo as as
|
||
} from 'lib';"""
|
||
eq toJS(input), output
|
||
|
||
test "CoffeeScript keywords can be used as imported names in import lists", ->
|
||
input = """
|
||
import { unless as bar } from 'lib'
|
||
bar.barMethod()"""
|
||
output = """
|
||
import {
|
||
unless as bar
|
||
} from 'lib';
|
||
|
||
bar.barMethod();"""
|
||
eq toJS(input), output
|
||
|
||
test "`*` can be used in an expression on the same line as an export keyword", ->
|
||
input = "export foo = (x) -> x * x"
|
||
output = """
|
||
export var foo = function(x) {
|
||
return x * x;
|
||
};"""
|
||
eq toJS(input), output
|
||
input = "export default foo = (x) -> x * x"
|
||
output = """
|
||
var foo;
|
||
|
||
export default foo = function(x) {
|
||
return x * x;
|
||
};"""
|
||
eq toJS(input), output
|
||
|
||
test "`*` and `from` can be used in an export default expression", ->
|
||
input = """
|
||
export default foo.extend
|
||
bar: ->
|
||
from = 5
|
||
from = from * 3"""
|
||
output = """
|
||
export default foo.extend({
|
||
bar: function() {
|
||
var from;
|
||
from = 5;
|
||
return from = from * 3;
|
||
}
|
||
});"""
|
||
eq toJS(input), output
|
||
|
||
test "wrapped members can be imported multiple times if aliased", ->
|
||
input = "import { foo, foo as bar } from 'lib'"
|
||
output = """
|
||
import {
|
||
foo,
|
||
foo as bar
|
||
} from 'lib';"""
|
||
eq toJS(input), output
|
||
|
||
test "default and wrapped members can be imported multiple times if aliased", ->
|
||
input = "import foo, { foo as bar } from 'lib'"
|
||
output = """
|
||
import foo, {
|
||
foo as bar
|
||
} from 'lib';"""
|
||
eq toJS(input), output
|
||
|
||
test "import a member named default", ->
|
||
input = "import { default } from 'lib'"
|
||
output = """
|
||
import {
|
||
default
|
||
} from 'lib';"""
|
||
eq toJS(input), output
|
||
|
||
test "import an aliased member named default", ->
|
||
input = "import { default as def } from 'lib'"
|
||
output = """
|
||
import {
|
||
default as def
|
||
} from 'lib';"""
|
||
eq toJS(input), output
|
||
|
||
test "export a member named default", ->
|
||
input = "export { default }"
|
||
output = """
|
||
export {
|
||
default
|
||
};"""
|
||
eq toJS(input), output
|
||
|
||
test "export an aliased member named default", ->
|
||
input = "export { def as default }"
|
||
output = """
|
||
export {
|
||
def as default
|
||
};"""
|
||
eq toJS(input), output
|
||
|
||
test "import an imported member named default", ->
|
||
input = "import { default } from 'lib'"
|
||
output = """
|
||
import {
|
||
default
|
||
} from 'lib';"""
|
||
eq toJS(input), output
|
||
|
||
test "import an imported aliased member named default", ->
|
||
input = "import { default as def } from 'lib'"
|
||
output = """
|
||
import {
|
||
default as def
|
||
} from 'lib';"""
|
||
eq toJS(input), output
|
||
|
||
test "export an imported member named default", ->
|
||
input = "export { default } from 'lib'"
|
||
output = """
|
||
export {
|
||
default
|
||
} from 'lib';"""
|
||
eq toJS(input), output
|
||
|
||
test "export an imported aliased member named default", ->
|
||
input = "export { default as def } from 'lib'"
|
||
output = """
|
||
export {
|
||
default as def
|
||
} from 'lib';"""
|
||
eq toJS(input), output
|
||
|
||
test "#4394: export shouldn't prevent variable declarations", ->
|
||
input = """
|
||
x = 1
|
||
export { x }
|
||
"""
|
||
output = """
|
||
var x;
|
||
|
||
x = 1;
|
||
|
||
export {
|
||
x
|
||
};
|
||
"""
|
||
eq toJS(input), output
|
||
|
||
test "#4451: `default` in an export statement is only treated as a keyword when it follows `export` or `as`", ->
|
||
input = "export default { default: 1 }"
|
||
output = """
|
||
export default {
|
||
"default": 1
|
||
};
|
||
"""
|
||
eq toJS(input), output
|
||
|
||
test "#4491: import- and export-specific lexing should stop after import/export statement", ->
|
||
input = """
|
||
import {
|
||
foo,
|
||
bar as baz
|
||
} from 'lib'
|
||
|
||
foo as
|
||
3 * as 4
|
||
from 'foo'
|
||
"""
|
||
output = """
|
||
import {
|
||
foo,
|
||
bar as baz
|
||
} from 'lib';
|
||
|
||
foo(as);
|
||
|
||
3 * as(4);
|
||
|
||
from('foo');
|
||
"""
|
||
eq toJS(input), output
|
||
|
||
input = """
|
||
import { foo, bar as baz } from 'lib'
|
||
|
||
foo as
|
||
3 * as 4
|
||
from 'foo'
|
||
"""
|
||
output = """
|
||
import {
|
||
foo,
|
||
bar as baz
|
||
} from 'lib';
|
||
|
||
foo(as);
|
||
|
||
3 * as(4);
|
||
|
||
from('foo');
|
||
"""
|
||
eq toJS(input), output
|
||
|
||
input = """
|
||
import * as lib from 'lib'
|
||
|
||
foo as
|
||
3 * as 4
|
||
from 'foo'
|
||
"""
|
||
output = """
|
||
import * as lib from 'lib';
|
||
|
||
foo(as);
|
||
|
||
3 * as(4);
|
||
|
||
from('foo');
|
||
"""
|
||
eq toJS(input), output
|
||
|
||
input = """
|
||
export {
|
||
foo,
|
||
bar
|
||
}
|
||
|
||
foo as
|
||
3 * as 4
|
||
from 'foo'
|
||
"""
|
||
output = """
|
||
export {
|
||
foo,
|
||
bar
|
||
};
|
||
|
||
foo(as);
|
||
|
||
3 * as(4);
|
||
|
||
from('foo');
|
||
"""
|
||
eq toJS(input), output
|
||
|
||
input = """
|
||
export * from 'lib'
|
||
|
||
foo as
|
||
3 * as 4
|
||
from 'foo'
|
||
"""
|
||
output = """
|
||
export * from 'lib';
|
||
|
||
foo(as);
|
||
|
||
3 * as(4);
|
||
|
||
from('foo');
|
||
"""
|
||
eq toJS(input), output
|