@expo/webpack-config
Version:
A Webpack configuration used to bundle Expo websites with Expo CLI.
63 lines • 2.45 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
const tapable_1 = require("tapable");
const webpack_1 = require("webpack");
const hooksMap = new WeakMap();
function createWebpackPluginHooks() {
return {
beforeEmit: new tapable_1.AsyncSeriesWaterfallHook(['pluginArgs']),
afterEmit: new tapable_1.AsyncSeriesWaterfallHook(['pluginArgs']),
};
}
class JsonWebpackPlugin {
constructor(options) {
this.options = options;
this.writeObject = async (compilation) => {
let result = {
json: this.options.json,
path: this.options.path,
plugin: this,
};
try {
result = await JsonWebpackPlugin.getHooks(compilation).beforeEmit.promise(result);
}
catch (error) {
compilation.errors.push(error);
}
const json = JSON.stringify(result.json, undefined, this.options.pretty ? 2 : undefined);
// Once all files are added to the webpack compilation
// let the webpack compiler continue
compilation.emitAsset(result.path, new webpack_1.sources.RawSource(json));
await JsonWebpackPlugin.getHooks(compilation).afterEmit.promise({
json,
outputName: result.path,
plugin: this,
});
};
if (!this.options.path || !this.options.json) {
throw new Error('Failed to write json because either `path` or `json` were not defined.');
}
}
static getHooks(compilation) {
let hooks = hooksMap.get(compilation);
// Setup the hooks only once
if (hooks === undefined) {
hooks = createWebpackPluginHooks();
hooksMap.set(compilation, hooks);
}
return hooks;
}
apply(compiler) {
compiler.hooks.compilation.tap(this.constructor.name, (compilation) => {
compilation.hooks.processAssets.tapPromise({
name: this.constructor.name,
// https://github.com/webpack/webpack/blob/master/lib/Compilation.js#L3280
stage: webpack_1.Compilation.PROCESS_ASSETS_STAGE_ADDITIONAL,
}, async () => {
await this.writeObject(compilation);
});
});
}
}
exports.default = JsonWebpackPlugin;
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