What is the process for creating a alert/error message if non-string variables are utilized within string interpolation?

When writing the following code in TypeScript, no errors are produced:

const maybe_a_string: undefined | string = undefined;
const false_or_string: false | string = false;

// I want to receive an error or warning for this line...
const message_string = `Some readable string info should be here: ${maybe_a_string}  ${false_or_string}`;

Is there a setting that can be enabled or simpler ways to rewrite the last line to get a warning when using non-string variables inside strings like this? (without having to manually assert each sub-string)

It seems that TypeScript considers it valid because certain types like booleans, numbers, and miscellaneous objects have a .toString() method...

However, particularly with undefined (which actually lacks a .toString() method), it's common to introduce bugs where unintentional occurrences of "undefined" appear within strings. This often happens in situations where end users see unexpected phrases like "hello undefined."

stringtypescriptsubstringconcatenationtostring

Answer №1

In my opinion, the best approach would be to transform the string template into a function. This method allows you to enforce that the arguments passed must be strings.

const createMessageString = (first: string, second: string): string => {
    return `Here is some descriptive string information: ${first}  ${second}`;
}

const message_string = createMessageString( maybe_a_string, false_or_string );
// An error will occur unless the types are specifically defined

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