Generator definition shorthand outputs as function

[webpack-bot]

Bug report

What is the current behavior?

The shorthand for defining a generator method in an object is sometimes parsed as a function. In some cases, this raises an uncaught syntax error in the browser (because keywords such as yield, yield* cannot be used in functions), causing the site to fail in executing the bundled js file.

If the current behavior is a bug, please provide the steps to reproduce.

Input src/index.js:

export const foo = {
  *bar() { return yield 'something' }
}

Output dist/main.js:

...const n={bar:()=>yield"something"}}]);

What is the expected behavior?

The output should be,

...const n={*bar(){return yield"something"}}}]);

Other relevant information:
webpack version: 4.12.0
Node.js version: v9.11.1
Operating System: Debian 9.4 stretch
Additional tools: -

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This issue was moved from webpack/webpack#7566 by @sokra. Original issue was by @ningyuansg.

[alexander-akait]

/cc @kzc need issue problem in terser?

[kzc]

Likely already fixed in terser. You can test it yourself.

[alexander-akait]

Close in favor #298