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 wxy
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/*
* This file uses webpack to compile a template with a child compiler.
*
* [TEMPLATE] -> [JAVASCRIPT]
*
*/
'use strict';
const path = require('path');
const NodeTemplatePlugin = require('webpack/lib/node/NodeTemplatePlugin');
const NodeTargetPlugin = require('webpack/lib/node/NodeTargetPlugin');
const LoaderTargetPlugin = require('webpack/lib/LoaderTargetPlugin');
const LibraryTemplatePlugin = require('webpack/lib/LibraryTemplatePlugin');
const SingleEntryPlugin = require('webpack/lib/SingleEntryPlugin');
/**
* Compiles the template into a nodejs factory, adds its to the compilation.assets
* and returns a promise of the result asset object.
*
* @param template relative path to the template file
* @param context path context
* @param outputFilename the file name
* @param compilation The webpack compilation object
*
* Returns an object:
* {
* hash: {String} - Base64 hash of the file
* content: {String} - Javascript executable code of the template
* }
*
*/
module.exports.compileTemplate = function compileTemplate (template, context, outputFilename, compilation) {
// The entry file is just an empty helper as the dynamic template
// require is added in "loader.js"
const outputOptions = {
filename: outputFilename,
publicPath: compilation.outputOptions.publicPath
};
// Store the result of the parent compilation before we start the child compilation
const assetsBeforeCompilation = Object.assign({}, compilation.assets[outputOptions.filename]);
// Create an additional child compiler which takes the template
// and turns it into an Node.JS html factory.
// This allows us to use loaders during the compilation
const compilerName = getCompilerName(context, outputFilename);
const childCompiler = compilation.createChildCompiler(compilerName, outputOptions);
childCompiler.context = context;
new NodeTemplatePlugin(outputOptions).apply(childCompiler);
new NodeTargetPlugin().apply(childCompiler);
new LibraryTemplatePlugin('HTML_WEBPACK_PLUGIN_RESULT', 'var').apply(childCompiler);
// Using undefined as name for the SingleEntryPlugin causes a unexpected output as described in
// https://github.com/jantimon/html-webpack-plugin/issues/895
// Using a string as a name for the SingleEntryPlugin causes problems with HMR as described in
// https://github.com/jantimon/html-webpack-plugin/issues/900
// Until the HMR issue is fixed we keep the ugly output:
new SingleEntryPlugin(this.context, template, undefined).apply(childCompiler);
new LoaderTargetPlugin('node').apply(childCompiler);
// Fix for "Uncaught TypeError: __webpack_require__(...) is not a function"
// Hot module replacement requires that every child compiler has its own
// cache. @see https://github.com/ampedandwired/html-webpack-plugin/pull/179
// Backwards compatible version of: childCompiler.hooks.compilation
(childCompiler.hooks ? childCompiler.hooks.compilation.tap.bind(childCompiler.hooks.compilation, 'HtmlWebpackPlugin') : childCompiler.plugin.bind(childCompiler, 'compilation'))(compilation => {
if (compilation.cache) {
if (!compilation.cache[compilerName]) {
compilation.cache[compilerName] = {};
}
compilation.cache = compilation.cache[compilerName];
}
});
// Compile and return a promise
return new Promise((resolve, reject) => {
childCompiler.runAsChild((err, entries, childCompilation) => {
// Resolve / reject the promise
if (childCompilation && childCompilation.errors && childCompilation.errors.length) {
const errorDetails = childCompilation.errors.map(error => error.message + (error.error ? ':\n' + error.error : '')).join('\n');
reject(new Error('Child compilation failed:\n' + errorDetails));
} else if (err) {
reject(err);
} else {
// Replace [hash] placeholders in filename
// In webpack 4 the plugin interface changed, so check for available fns
const outputName = compilation.mainTemplate.getAssetPath
? compilation.mainTemplate.hooks.assetPath.call(outputOptions.filename, {
hash: childCompilation.hash,
chunk: entries[0]
})
: compilation.mainTemplate.applyPluginsWaterfall(
'asset-path',
outputOptions.filename,
{
hash: childCompilation.hash,
chunk: entries[0]
});
// Restore the parent compilation to the state like it
// was before the child compilation
compilation.assets[outputName] = assetsBeforeCompilation[outputName];
if (assetsBeforeCompilation[outputName] === undefined) {
// If it wasn't there - delete it
delete compilation.assets[outputName];
}
resolve({
// Hash of the template entry point
hash: entries[0].hash,
// Output name
outputName: outputName,
// Compiled code
content: childCompilation.assets[outputName].source()
});
}
});
});
};
/**
* Returns the child compiler name e.g. 'html-webpack-plugin for "index.html"'
*/
function getCompilerName (context, filename) {
const absolutePath = path.resolve(context, filename);
const relativePath = path.relative(context, absolutePath);
return 'html-webpack-plugin for "' + (absolutePath.length < relativePath.length ? absolutePath : relativePath) + '"';
}
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