-
Notifications
You must be signed in to change notification settings - Fork 0
/
transform.test.js
263 lines (202 loc) · 8.26 KB
/
transform.test.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
/* eslint-env jest */
const { prepareCode } = require('./transform.js');
const cleanString = (x) =>
x.replace(/\s+/g, ' ');
const testTransform = (before, after) =>
test(cleanString(before), () => {
expect(cleanString(prepareCode(before)))
.toBe(cleanString(after));
});
// ## variable declarations
testTransform('const x = 1;', 'var x = 1;');
testTransform('let x = 1;', 'var x = 1;');
testTransform('var x = await Promise.resolve(1);', 'var x; x = await Promise.resolve(1);');
testTransform('let x = await Promise.resolve(2);', 'var x; x = await Promise.resolve(2);');
testTransform('const x = await Promise.resolve(3);', 'var x; x = await Promise.resolve(3);');
testTransform('const f = async() => { await Promise.resolve(4); }',
`var f_hakk_ = async () => { await Promise.resolve(4); };
var f = (...args) => f_hakk_(...args);`);
testTransform('const f = async() => { var y = await Promise.resolve(4); }',
`var f_hakk_ = async () => { var y = await Promise.resolve(4); };
var f = (...args) => f_hakk_(...args);`);
// ## class declarations and expressions
testTransform('class A {}', 'var A = class A {};');
testTransform(
`class A {
method1(a, b) {
return a + b;
}
}`,
`var A = class A {};
A.prototype.method1 = function (a, b) {
return a + b;
};`);
testTransform(
`class A {
field1 = 3;
}`,
`var A = class A {};
A.prototype.field1 = 3;`);
testTransform(
`class A {
#method1(a, b) {
return a + b;
}
}`,
`var A = class A {};
A.prototype._PRIVATE_method1 = function (a, b) {
return a + b;
};`);
testTransform(
`class A {
#field1 = 7;
}`,
`var A = class A {};
A.prototype._PRIVATE_field1 = 7;`);
testTransform(
`class A extends B {
constructor(b, a) {
super(a, b);
}
method1(x) {
return x;
}
}`,
`var A = class A extends B {
constructor(b, a) {
super(a, b);
}
};
A.prototype.method1 = function (x) {
return x;
};`);
testTransform(
'const x = 1, y = 2, z = 3;',
`var x = 1;
var y = 2;
var z = 3;`);
// ## `import()` calls
testTransform("var {test} = await import('./test.js');",
"var test; ({ test } = await __import('./test.js'));");
// ## `import` syntax
// Testing all cases in
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import#syntax
testTransform('import defaultExport from "module-name";',
"var defaultExport; ({ default: defaultExport } = await __import('module-name'));");
testTransform('import * as name from "module-name";',
"var name; name = await __import('module-name');");
testTransform('import { export1 } from "module-name";',
"var export1; ({ export1 } = await __import('module-name'));");
testTransform('import { export1 as alias1 } from "module-name";',
"var alias1; ({ export1: alias1 } = await __import('module-name'));");
testTransform('import { default as alias } from "module-name";',
"var alias; ({ default: alias } = await __import('module-name'));");
testTransform('import { export1, export2 } from "module-name";',
"var export1; var export2; ({ export1, export2 } = await __import('module-name'));");
testTransform('import { export1, export2 as alias2 } from "module-name";',
"var export1; var alias2; ({ export1, export2: alias2 } = await __import('module-name'));");
testTransform('import { "string name" as alias } from "module-name";',
"var alias; ({ 'string name': alias } = await __import('module-name'));");
testTransform('import defaultExport, { export1 } from "module-name";',
"var defaultExport; var export1; ({ default: defaultExport, export1 } = await __import('module-name'));");
testTransform('import defaultExport, * as name from "module-name";',
`var name; name = await __import('module-name');
var { default: defaultExport } = name;`);
testTransform('import "module-name";',
"await __import('module-name');");
// ## `export` syntax
// TODO: Test all cases shown in
// https://developer.mozilla.org/en-US/docs/web/javascript/reference/statements/export#syntax
// ### Exporting declarations
testTransform('export let name1, name2',
`var name1;
var name2;
module.exports.name1 = name1;
module.exports.name2 = name2;`);
testTransform('export const name1 = 1, name2 = 2;',
`var name1 = 1;
var name2 = 2;
module.exports.name1 = name1;
module.exports.name2 = name2;`);
testTransform('export function functionName() { /* … */ }',
`var functionName_hakk_ = function functionName() {/* … */};
var functionName = (...args) => functionName_hakk_(...args);
module.exports.functionName = functionName;`);
testTransform('export class ClassName { /* … */ }',
`var ClassName = class ClassName {/* … */};
module.exports.ClassName = ClassName;`);
testTransform('export function* generatorFunctionName() { /* … */ }',
`var generatorFunctionName_hakk_ = function* generatorFunctionName() {/* … */};
var generatorFunctionName = (...args) => generatorFunctionName_hakk_(...args);
module.exports.generatorFunctionName = generatorFunctionName;`);
testTransform('export const { name1, name2: bar } = o;',
`var { name1, name2: bar } = o;
module.exports.name1 = o.name1;
module.exports.bar = o.name2;`);
testTransform('export const [ name1, name2 ] = array;',
`var [name1, name2] = array;
module.exports.name1 = array[0];
module.exports.name2 = array[1];`);
// ### Export list
testTransform('let x = 1, y = 2; export { x, y }',
'var x = 1; var y = 2; module.exports.x = x; module.exports.y = y;');
testTransform('let x = 1, y = 2; export { x as name1, y as name2}',
'var x = 1; var y = 2; module.exports.name1 = x; module.exports.name2 = y;');
testTransform('let x = 1, y = 2; export { x as "name1", y as "name2"}',
'var x = 1; var y = 2; module.exports[\'name1\'] = x; module.exports[\'name2\'] = y;');
testTransform('let x = 1; export { x as default}',
'var x = 1; module.exports.default = x;');
// ### Default exports
testTransform('export default expression;',
'module.exports.default = expression;');
testTransform('export default function functionName() { /* … */ }',
'module.exports.default = function functionName() {/* … */};');
testTransform('export default class ClassName { /* … */ }',
'module.exports.default = class ClassName {/* … */};');
testTransform('export default function* generatorFunctionName() { /* … */ }',
'module.exports.default = function* generatorFunctionName() {/* … */};');
testTransform('export default function () { /* … */ }',
'module.exports.default = function () {/* … */};');
testTransform('export default class { /* … */ }',
'module.exports.default = class {/* … */};');
testTransform('export default function* () { /* … */ }',
'module.exports.default = function* () {/* … */};');
// ### Aggregating modules
testTransform('export * from "my-module-name"',
`await async function () {
const importedObject = await __import('my-module-name');
const propertyNames = Object.getOwnPropertyNames(importedObject);
for (const propertyName of propertyNames) {
if (propertyName !== 'default') {
module.exports[propertyName] = importedObject[propertyName];
}
}
}();`);
testTransform('export * as name1 from "module-name";',
`await async function () {
const importedObject = await __import('module-name');
const propertyNames = Object.getOwnPropertyNames(importedObject);
for (const propertyName of propertyNames) {
if (propertyName !== 'default') {
module.exports.name1[propertyName] = importedObject[propertyName];
}
}
}();`);
testTransform('export { name1, /* …, */ nameN } from "module-name";',
`await async function () {
const importedObject = await __import('module-name');
module.exports.name1 = importedObject.name1;
module.exports.nameN = importedObject.nameN;
}();`);
testTransform('export { import1 as name1, import2 as name2, /* …, */ nameN } from "module-name";',
`await async function () {
const importedObject = await __import('module-name');
module.exports.name1 = importedObject.import1;
module.exports.name2 = importedObject.import2;
module.exports.nameN = importedObject.nameN;
}();`);
testTransform('export { default, /* …, */ } from "module-name";',
`await async function () {
const importedObject = await __import('module-name');
module.exports.default = importedObject.default;
}();`);