Parameter Decorators

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function logPosition(target: any, propertyKey: string, parameterIndex: number) {
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  console.log(parameterIndex);
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}
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​
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class Cow {
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  say(b: string, @logPosition c: boolean) {
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    console.log(b);
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  }
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}
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​
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new Cow().say('hello', false); // outputs 1 (newline) hello
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The above demonstrates decorating method parameters. Readers familiar with Angular can now imagine how Angular implemented their @Inject() system.

Class Decorators

The JavaScript Toolchain

Last modified 2yr ago

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