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index.js
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index.js
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const path = require('path');
const fs = require('fs');
const defaultOptions = {
replaceDistFileIfHMR: false,
};
class ReplaceResourcesPlugin {
constructor(copyFromFileRegExp, copyToFileRegExp, options = defaultOptions) {
this.name = 'ReplaceResourcesPlugin';
this.copyFromFileRegExp = copyFromFileRegExp;
this.copyToFileRegExp = copyToFileRegExp;
this.sourceFilesStore = {};
this.distFilesStore = {};
this.listenToHMR = options.replaceDistFileIfHMR;
}
processError(err) {
console.log(`The below error occurred in the ${this.name}:`);
console.error(err);
process.exit(1);
}
scanDirectory(directory) {
return new Promise((resolve, reject) => {
fs.readdir(directory, (err, files) => {
if (err) {
reject(err);
return;
}
resolve(files);
});
});
}
exportFileData(file) {
return new Promise((resolve, reject) => {
fs.readFile(file, (err, data) => {
if (err) {
reject(err);
return;
}
resolve(data);
});
});
}
resolvePath(context, filename) {
return path.resolve(
context,
filename,
);
}
async copyFileData(srcFilePath, distFilePath) {
const data = await this.exportFileData(srcFilePath);
fs.writeFile(distFilePath, data, (err) => {
if (err) {
this.processError(err);
}
});
}
storeFile(context, srcFile, distFilePath) {
const srcFilePath = this.resolvePath(context, srcFile);
this.sourceFilesStore[srcFilePath] = {
dist: distFilePath,
};
this.distFilesStore[distFilePath] = true;
this.copyFileData(srcFilePath, distFilePath);
fs.watchFile(srcFilePath, () => {
console.log(`${this.name}: ${srcFile} has been changed`);
this.copyFileData(srcFilePath, distFilePath);
});
}
isDistFileStored(distFilePath) {
return !!this.distFilesStore[distFilePath];
}
apply(compiler) {
compiler.hooks.compilation.tap(
'ReplaceResourcesPlugin',
(compilation) => {
compilation.hooks.buildModule.tap('ReplaceResourcesPlugin', async (result) => {
if (!result) {
return null;
}
try {
const { resource, context, hotUpdate } = result;
if (
!this.isDistFileStored(resource) &&
this.copyToFileRegExp.test(resource) &&
(hotUpdate === undefined ||
(hotUpdate === true && this.listenToHMR))
) {
const files = await this.scanDirectory(context);
for (let i = 0; i < files.length; i += 1) {
const matchedFile = this.copyFromFileRegExp.exec(files[i]);
if (matchedFile) {
this.storeFile(context, matchedFile.input, resource);
return result;
}
}
return result;
}
return result;
} catch (err) {
this.processError(err);
}
});
},
);
}
}
module.exports = ReplaceResourcesPlugin;