Angular Pipe -- Implicit type 'any' error occurs when trying to index type 'string' with an expression

Encountering an error while constructing the time ago pipe:

Obtaining an implicit 'any' type due to inability to index type with a 'string' expression

if (value) {
      const seconds = Math.floor(
        (+new Date() - +new Date(Number(value))) / 1000
      );
      if (seconds < 60) {
        return "Just now";
      }
      const intervals = {
        year: 365 * 24 * 60 * 60,
        month: (52 * 7 * 24 * 60 * 60) / 12,
        week: 7 * 24 * 60 * 60,
        day: 24 * 60 * 60,
        hour: 60 * 60,
        minute: 60,
        second: 1
      };
      let counter;
      for (const i of Object.keys(intervals)) {
        counter = Math.floor(seconds / intervals[i]);
        if (counter > 0) {
          if (counter === 1) {
            return counter + " " + i + " ago"; // singular
          } else {
            return counter + " " + i + "s ago"; // plural
          }
        }
      }
    }
    return value;
intervals[i]

This particular section is responsible for triggering the error.

I've attempted various approaches to alter the type or access this object, but have yet to find a successful solution.

Answer №1

When working with TypeScript, you may encounter this error if you fail to specify that an object's keys should be of type string and return a number.

const intervals: { [key: string]: number } = {
...
}

The keys in TypeScript objects can be of type string, number, symbol, or template literal, and each key can be assigned a different return type. If you do not define these types explicitly, the type checker will default to any, potentially leading to bugs going unnoticed in your code.

For further details, refer to the documentation: https://www.typescriptlang.org/docs/handbook/2/objects.html#index-signatures

Answer №2

I made the necessary adjustment by including the following line in tsconfig.json:

"suppressImplicitAnyIndexErrors": true,

After making this change, the issue was resolved.

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