File size: 4,636 Bytes
da39a92 | 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 | import { OnResolveArgs, Plugin } from 'esbuild'
import escapeStringRegexp from 'escape-string-regexp'
import fs from 'fs'
import path from 'path'
import esbuild from 'esbuild'
import { builtinsPolyfills } from './polyfills'
// import { NodeResolvePlugin } from '@esbuild-plugins/node-resolve'
const NAME = 'node-modules-polyfills'
const NAMESPACE = NAME
function removeEndingSlash(importee) {
if (importee && importee.slice(-1) === '/') {
importee = importee.slice(0, -1)
}
return importee
}
export interface NodePolyfillsOptions {
name?: string
namespace?: string
}
export function NodeModulesPolyfillPlugin(
options: NodePolyfillsOptions = {},
): Plugin {
const { namespace = NAMESPACE, name = NAME } = options
if (namespace.endsWith('commonjs')) {
throw new Error(`namespace ${namespace} must not end with commonjs`)
}
// this namespace is needed to make ES modules expose their default export to require: require('assert') will give you import('assert').default
const commonjsNamespace = namespace + '-commonjs'
const polyfilledBuiltins = builtinsPolyfills()
const polyfilledBuiltinsNames = [...polyfilledBuiltins.keys()]
return {
name,
setup: function setup({ onLoad, onResolve, initialOptions }) {
// polyfills contain global keyword, it must be defined
if (initialOptions?.define && !initialOptions.define?.global) {
initialOptions.define['global'] = 'globalThis'
} else if (!initialOptions?.define) {
initialOptions.define = { global: 'globalThis' }
}
// TODO these polyfill module cannot import anything, is that ok?
async function loader(
args: esbuild.OnLoadArgs,
): Promise<esbuild.OnLoadResult> {
try {
const argsPath = args.path.replace(/^node:/, '')
const isCommonjs = args.namespace.endsWith('commonjs')
const resolved = polyfilledBuiltins.get(
removeEndingSlash(argsPath),
)
const contents = await (
await fs.promises.readFile(resolved)
).toString()
let resolveDir = path.dirname(resolved)
if (isCommonjs) {
return {
loader: 'js',
contents: commonJsTemplate({
importPath: argsPath,
}),
resolveDir,
}
}
return {
loader: 'js',
contents,
resolveDir,
}
} catch (e) {
console.error('node-modules-polyfill', e)
return {
contents: `export {}`,
loader: 'js',
}
}
}
onLoad({ filter: /.*/, namespace }, loader)
onLoad({ filter: /.*/, namespace: commonjsNamespace }, loader)
const filter = new RegExp(
[
...polyfilledBuiltinsNames,
...polyfilledBuiltinsNames.map((n) => `node:${n}`),
]
.map(escapeStringRegexp)
.join('|'), // TODO builtins could end with slash, keep in mind in regex
)
async function resolver(args: OnResolveArgs) {
const argsPath = args.path.replace(/^node:/, '')
const ignoreRequire = args.namespace === commonjsNamespace
if (!polyfilledBuiltins.has(argsPath)) {
return
}
const isCommonjs =
!ignoreRequire && args.kind === 'require-call'
return {
namespace: isCommonjs ? commonjsNamespace : namespace,
path: argsPath,
}
}
onResolve({ filter }, resolver)
// onResolve({ filter: /.*/, namespace }, resolver)
},
}
}
function commonJsTemplate({ importPath }) {
return `
const polyfill = require('${importPath}')
if (polyfill && polyfill.default) {
module.exports = polyfill.default
for (let k in polyfill) {
module.exports[k] = polyfill[k]
}
} else if (polyfill) {
module.exports = polyfill
}
`
}
export default NodeModulesPolyfillPlugin
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