Accessing an object key through a variable is possible in the Angular component but not in the HTML

I have stored some strings on an object in my environment file for global use.

Here is the content of my environment.ts:

export interface RegionNames {
  br: any;
  bo: any;
}

export const environment = {
  production: false,
  region_id: "br",
};

export const region_phrases: RegionNames = {
  br: {
    "string1": "A",
    "string2": "B",
    "string3": "C",
    "string4": "D",
    "string5": "E",
  },
  bo: {
    "string1": "AA",
    "string2": "BB",
    "string3": "CC",
    "string4": "DD",
    "string5": "EE",
  }
}

In the component script, I can successfully access the strings from the object using this code:

console.log(region_phrases[environment.region_id as keyof RegionNames].string1);

However, when I try to run the same code in the HTML template, it throws an error:

Error TS7053: Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'RegionNames'. No index signature with a parameter of type 'string' was found on type 'RegionNames'.

<span class="visually-hidden">{{ region_phrases[environment.region_id as keyof RegionNames].string1 }}</span>

I don't want to create variables for the object in every component just to access it in the HTML. Is there a simpler way to resolve this issue?

Answer №1

Define the environment variable like this:

export const environment: { production: false; region_id: keyof RegionNames } =
  {
    production: false,
    region_id: 'br',
  };

In your HTML, do not include as keyof RegionNames.

<span class="visually-hidden">{{ region_phrases[environment.region_id].string1 }}</span>

View Demo on StackBlitz

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