stream#TransformOptions TypeScript Examples

The following examples show how to use stream#TransformOptions. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example #1
Source File: utils.ts    From kfp-tekton-backend with Apache License 2.0 7 votes vote down vote up 
constructor({ peek, ...opts }: PreviewStreamOptions) {
    // acts like passthrough
    let transform: TransformOptions['transform'] = (chunk, _encoding, callback) =>
      callback(undefined, chunk);
    // implements preview - peek must be positive number
    if (peek && peek > 0) {
      let size = 0;
      transform = (chunk, _encoding, callback) => {
        const delta = peek - size;
        size += chunk.length;
        if (size >= peek) {
          callback(undefined, chunk.slice(0, delta));
          this.resume(); // do not handle any subsequent data
          return;
        }
        callback(undefined, chunk);
      };
    }
    super({ ...opts, transform });
  }