How to use 'remove function in javascript' in JavaScript

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export function removeTemplateInformation(functionName: string) {
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  let result = '';
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  let depth = 0;
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  let start = 0; // Start of a segment we'd like to keep
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  // We start the loop at i = 1 because we don't want to extract any
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  // template-like information starting at the beginning of the string:
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  // templates can't occur before the name of a function, so this is certainly
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  // an HTML tag like <script>.
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  for (let i = 1; i < functionName.length; i++) {
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    // We also don't want to extract template-like information that start after
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    // a space, as that won't likely be a real template information and
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    // probably rather an HTML tag name.
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    if (functionName[i] === '<' && functionName[i - 1] !== ' ') {
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      if (depth === 0) {
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        // Template information begins, save segment
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        result += functionName.substr(start, i - start);
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        // Start a new segment here to not lose the rest of the string
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        // should we find no matching '>'
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        start = i;
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      }
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      depth++;
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    } else if (functionName[i] === '>') {
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      depth--;
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      if (depth === 0) {
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        // Template information ends, start of new segment
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        start = i + 1;
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      }
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    }
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  }
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  result += functionName.substr(start);
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  return result;
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}