angular-cn/tools/broccoli/broccoli-tree-stabilizer.ts

46 lines
1.3 KiB
TypeScript

/// <reference path="broccoli.d.ts" />
/// <reference path="../typings/node/node.d.ts" />
import fs = require('fs');
let symlinkOrCopy = require('symlink-or-copy');
/**
* Stabilizes the inputPath for the following plugins in the build tree.
*
* All broccoli plugins that inherit from `broccoli-writer` or `broccoli-filter` change their
* outputPath during each rebuild.
*
* This means that all following plugins in the build tree can't rely on their inputPath being
* immutable. This results in breakage of any plugin that is not expecting such behavior.
*
* For example all `DiffingBroccoliPlugin`s expect their inputPath to be stable.
*
* By inserting this plugin into the tree after any misbehaving plugin, we can stabilize the
* inputPath for the following plugin in the tree and correct the surprising behavior.
*/
class TreeStabilizer implements BroccoliTree {
inputPath: string;
outputPath: string;
constructor(public inputTree: BroccoliTree) {}
rebuild() {
fs.rmdirSync(this.outputPath);
// TODO: investigate if we can use rename the directory instead to improve performance on
// Windows
symlinkOrCopy.sync(this.inputPath, this.outputPath);
}
cleanup() {}
}
export default function stabilizeTree(inputTree: BroccoliTree): BroccoliTree {
return new TreeStabilizer(inputTree);
}