fuse-box/src/core/ExtensionOverrides.ts

Fuse-Box a bundler that does it right

import { File } from './File';
import * as fs from 'fs';
import * as path from 'path';

export class ExtensionOverrides {
  public overrides: string[];

  constructor(overrides: string[]) {
    this.overrides = [];
    overrides.forEach((override) => this.add(override));
  }

  private isValid(override: string) {
    return (typeof override === 'string' && override.indexOf('.') === 0);
  }

  public add(override: string) {
    if (this.isValid(override)) {
      this.overrides.push(override);
    }
  }

  public setOverrideFileInfo(file: File): string {
    if (this.overrides.length === 0 || !file.belongsToProject()) {
      return;
    }

    const fileInfo = path.parse(file.info.absPath);

    for (let overrideExtension of this.overrides) {
      const overridePath = path.resolve(fileInfo.dir, `${fileInfo.name}${overrideExtension}`);

      if (overrideExtension.indexOf(fileInfo.ext) > -1 && fs.existsSync(overridePath)) {
        file.absPath = file.info.absPath = overridePath;
        file.hasExtensionOverride = true;
        file.context.log.echoInfo(`Extension override found. Mapping ${file.info.fuseBoxPath} to ${path.basename(file.info.absPath)}`)
      }
    }
  }

  public getPathOverride(pathStr: string) {
    if (this.overrides.length === 0) {
      return;
    }

    const fileInfo = path.parse(pathStr);

    for (let overrideExtension of this.overrides) {
      const overridePath = path.resolve(fileInfo.dir, `${fileInfo.name}${overrideExtension}`);

      if (overrideExtension.indexOf(fileInfo.ext) > -1 && fs.existsSync(overridePath)) {
        return overridePath;
      }
    }
  }
}