I am currently working with Angular 4 and developing a string pipe to add zeros for padding. However, both Angular and VS Code are displaying errors stating that the prototype "padStart" does not exist.
What steps can I take to enable this support in my project and/or editor?
How can I incorporate a polyfill if, for example, padStart is not available?
Make sure to update the lib in your tsconfig.json file to es2017.
Set Target Version (--target)
Specify the version of ECMAScript target you want to use.
Include Library Files (--lib)
List of library files that should be included during compilation.
By changing the lib to es2017, you will import typings for VSCode and can utilize polyfills for compilation purposes.
Example
{
"compileOnSave": false,
"compilerOptions": {
// ...
"target": "es2015",
// ...
"lib": [
"dom",
"es2017" // <-- make sure to switch to es2017
],
"paths": { ... }
}
}
You can refer to TypeScript's documentation for a comprehensive list of compiler options.
In Angular, there are various polyfills available but are often commented out in the polyfills.ts file. You can uncomment needed polyfills and install any necessary dependencies using npm or yarn. For this case, you only require the string prototype polyfill from ES7.
To modify your polyfills.ts, include the following line:
import 'core-js/es7/string';
The addition of padStart is classified under es2017 (or es7).
If you prefer, you have the option to download and utilize the mdn-polyfills package by adding this code snippet:
import 'mdn-polyfills/String.prototype.padStart';To avoid potential issues with polyfilling ES2017 typings unnecessarily, consider focusing on implementing only the specific ES2017.string feature.
import 'core-js/es7/string'; in your polyfill.ts fileES2017.string to the lib option within your tsconfig.json configurationThe lib option informs the compiler about available methods at runtime without adding any additional code. This is why importing the necessary polyfill is crucial to prevent compatibility issues in older browsers where certain functionalities may not be supported.
In my view, relying solely on the acceptance of all ES2017 features can be risky, as it might lead to overlooking the need to polyfill other essential components. It's important to acknowledge that simply having access to ALL ES2017 typings doesn't guarantee seamless implementation.
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