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fs.js
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fs.js
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'use strict';
const fs = require('fs');
const path = require('path');
const MemoryFileSystem = require('memory-fs');
const mkdirp = require('mkdirp');
const { colors } = require('webpack-log');
const DevMiddlewareError = require('./DevMiddlewareError');
module.exports = {
toDisk(context) {
const compilers = context.compiler.compilers || [context.compiler];
for (const compiler of compilers) {
compiler.hooks.emit.tap('WebpackDevMiddleware', (compilation) => {
compiler.hooks.assetEmitted.tapAsync(
'WebpackDevMiddleware',
(file, content, callback) => {
let targetFile = file;
const queryStringIdx = targetFile.indexOf('?');
if (queryStringIdx >= 0) {
targetFile = targetFile.substr(0, queryStringIdx);
}
let { outputPath } = compiler;
// TODO Why? Need remove in future major release
if (outputPath === '/') {
outputPath = compiler.context;
}
outputPath = compilation.getPath(outputPath, {});
const targetPath = path.join(outputPath, targetFile);
const { writeToDisk: filter } = context.options;
const allowWrite =
filter && typeof filter === 'function'
? filter(targetPath)
: true;
if (!allowWrite) {
return callback();
}
const { log } = context;
const dir = path.dirname(targetPath);
return mkdirp(dir, (mkdirpError) => {
if (mkdirpError) {
return callback(mkdirpError);
}
return fs.writeFile(targetPath, content, (writeFileError) => {
if (writeFileError) {
return callback(writeFileError);
}
log.debug(
colors.cyan(
`Asset written to disk: ${path.relative(
process.cwd(),
targetPath
)}`
)
);
return callback();
});
});
}
);
});
}
},
setFs(context, compiler) {
if (
typeof compiler.outputPath === 'string' &&
!path.posix.isAbsolute(compiler.outputPath) &&
!path.win32.isAbsolute(compiler.outputPath)
) {
throw new DevMiddlewareError(
'`output.path` needs to be an absolute path or `/`.'
);
}
let fileSystem;
// store our files in memory
const isConfiguredFs = context.options.fs;
const isMemoryFs =
!isConfiguredFs &&
!compiler.compilers &&
compiler.outputFileSystem instanceof MemoryFileSystem;
if (isConfiguredFs) {
// eslint-disable-next-line no-shadow
const { fs } = context.options;
if (typeof fs.join !== 'function') {
// very shallow check
throw new Error(
'Invalid options: options.fs.join() method is expected'
);
}
// eslint-disable-next-line no-param-reassign
compiler.outputFileSystem = fs;
fileSystem = fs;
} else if (isMemoryFs) {
fileSystem = compiler.outputFileSystem;
} else {
fileSystem = new MemoryFileSystem();
// eslint-disable-next-line no-param-reassign
compiler.outputFileSystem = fileSystem;
}
// eslint-disable-next-line no-param-reassign
context.fs = fileSystem;
},
};