TranslateParser API
The TranslateParser is responsible for formatting your translated messages
and using parameters that you pass in.
Usually, you would not use the TranslateParser directly. It’s called in the
background when a translation string is requested in your app.
export abstract class TranslateParser { abstract interpolate(expr: string | Function, params?: any): string | undefined;}The interpolate() method is the core of the parser. It receives either a string or function expression and optional parameters, then returns the interpolated string.
The default parser’s interpolate method works as follows:
With string expressions:
parser.interpolate('This is a {{key}}!', {key: 'banana'})// Returns: "This is a banana!"With function expressions:
parser.interpolate((params) => `This is a ${params.key}`, {key: 'banana'})// Returns: "This is a banana!"If you are not using a compiler, you can expect expr to be a string.
The TranslateParser is called every time you request a translation with a given set of interpolation parameters.
If parsing these messages is too complex, we recommend using a compiler to pre-process your messages.
To implement your own parser, create a class that extends the TranslateParser abstract class and implements the interpolate() method.
For a complete example of how to build and register a custom parser, see the Write Your Own Parser recipe.