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index.js
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index.js
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const resolve = require("resolve");
const fs = require("fs");
const webpack = require("webpack");
const MemoryFS = require("memory-fs");
const WebpackParser = require("webpack/lib/Parser");
const webpackParse = WebpackParser.parse;
const terser = require("terser");
const shebangRegEx = require('./utils/shebang');
// overload the webpack parser so that we can make
// acorn work with the node.js / commonjs semantics
// of being able to `return` in the top level of a
// requireable module
// https://github.com/zeit/ncc/issues/40
WebpackParser.parse = function(source, opts = {}) {
return webpackParse.call(this, source, {
...opts,
allowReturnOutsideFunction: true
});
};
const SUPPORTED_EXTENSIONS = [".ts", ".tsx", ".js", ".mjs", ".json", ".node"];
function resolveModule(context, request, callback, forcedExternals = []) {
const resolveOptions = {
basedir: context,
preserveSymlinks: true,
extensions: SUPPORTED_EXTENSIONS
};
if (new Set(forcedExternals).has(request)) {
console.error(`ncc: Skipping bundling "${request}" per config`);
return callback(null, `commonjs ${request}`);
}
resolve(request, resolveOptions, err => {
if (err) {
console.error(
`ncc: Module directory "${context}" attempted to require "${request}" but could not be resolved, assuming external.`
);
return callback(null, `commonjs ${request}`);
}
callback();
});
}
module.exports = async (
entry,
{
externals = [],
minify = false,
sourceMap = false,
filename = "index.js"
} = {}
) => {
const shebangMatch = fs.readFileSync(resolve.sync(entry)).toString().match(shebangRegEx);
const mfs = new MemoryFS();
const assetNames = Object.create(null);
const assets = Object.create(null);
const compiler = webpack({
entry,
optimization: {
nodeEnv: false,
minimize: false
},
devtool: sourceMap ? "cheap-source-map" : false,
mode: "production",
target: "node",
output: {
path: "/",
filename,
libraryTarget: "commonjs2"
},
resolve: {
extensions: SUPPORTED_EXTENSIONS,
// webpack defaults to `module` and `main`, but that's
// not really what node.js supports, so we reset it
mainFields: ["main"]
},
// https://github.com/zeit/ncc/pull/29#pullrequestreview-177152175
node: false,
externals: (...args) => resolveModule(...[...args, externals]),
module: {
rules: [
{
parser: { amd: false },
use: [{
loader: __dirname + "/loaders/shebang-loader.js"
}]
},
{
test: /\.node$/,
use: [{
loader: __dirname + "/loaders/node-loader.js",
options: { assetNames, assets }
}]
},
{
test: /\.(js|mjs|tsx?)$/,
use: [{
loader: __dirname + "/loaders/relocate-loader.js",
options: { assetNames, assets }
}]
},
{
test: /\.tsx?$/,
use: [{
loader: __dirname + "/loaders/ts-loader.js",
options: {
compilerOptions: {
outDir: '//'
}
}
}]
}
]
},
plugins: [
{
apply(compiler) {
// override "not found" context to try built require first
compiler.hooks.compilation.tap("ncc", compilation => {
compilation.moduleTemplates.javascript.hooks.render.tap(
"ncc",
(
moduleSourcePostModule,
module,
options,
dependencyTemplates
) => {
if (
module._contextDependencies &&
moduleSourcePostModule._value.match(
/webpackEmptyAsyncContext|webpackEmptyContext/
)
) {
module.type = 'HACK'; // hack to ensure __webpack_require__ is added to wrapper
return moduleSourcePostModule._value.replace(
"var e = new Error",
`if (typeof req === 'number' && __webpack_require__.m[req])\n` +
` return __webpack_require__(req);\n` +
`try { return require(req) }\n` +
`catch (e) { if (e.code !== 'MODULE_NOT_FOUND') throw e }\n` +
`var e = new Error`
);
}
}
);
});
compiler.hooks.normalModuleFactory.tap("ncc", NormalModuleFactory => {
function handler(parser) {
parser.hooks.assign.for("require").intercept({
register: tapInfo => {
if (tapInfo.name !== "CommonJsPlugin") {
return tapInfo;
}
tapInfo.fn = () => {};
return tapInfo;
}
});
}
NormalModuleFactory.hooks.parser
.for("javascript/auto")
.tap("ncc", handler);
NormalModuleFactory.hooks.parser
.for("javascript/dynamic")
.tap("ncc", handler);
return NormalModuleFactory;
});
}
}
]
});
compiler.inputFileSystem = fs;
compiler.outputFileSystem = mfs;
compiler.resolvers.normal.fileSystem = mfs;
return new Promise((resolve, reject) => {
compiler.run((err, stats) => {
if (err) return reject(err);
if (stats.hasErrors()) {
return reject(new Error(stats.toString()));
}
const assets = Object.create(null);
getFlatFiles(mfs.data, assets);
delete assets[filename];
delete assets[filename + ".map"];
const code = mfs.readFileSync("/index.js", "utf8");
const map = sourceMap ? mfs.readFileSync("/index.js.map", "utf8") : null;
resolve({
code,
map,
assets
});
});
})
.then(({ code, map, assets }) => {
if (!minify)
return { code, map, assets };
const result = terser.minify(code, {
compress: false,
mangle: {
keep_classnames: true,
keep_fnames: true
},
sourceMap: sourceMap ? {
content: map,
filename,
url: filename + ".map"
} : false
});
// For some reason, auth0 returns "undefined"!
// custom terser phase used over Webpack integration for this reason
if (result.code === undefined)
return { code, map, assets };
return { code: result.code, map: result.map, assets };
})
.then(({ code, map, assets}) => {
if (!shebangMatch)
return { code, map, assets };
code = shebangMatch[0] + code;
// add a line offset to the sourcemap
if (map)
map.mappings = ";" + map.mappings;
return { code, map, assets };
})
};
// this could be rewritten with actual FS apis / globs, but this is simpler
function getFlatFiles(mfsData, output, curBase = "") {
for (const path of Object.keys(mfsData)) {
const item = mfsData[path];
const curPath = curBase + "/" + path;
// directory
if (item[""] === true) getFlatFiles(item, output, curPath);
// file
else if (!curPath.endsWith("/")) output[curPath.substr(1)] = mfsData[path];
}
}