42 lines
983 B
Plaintext
42 lines
983 B
Plaintext
// @flow strict
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/**
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* An ES6 string tag that fixes indentation. Also removes leading newlines
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* and trailing spaces and tabs, but keeps trailing newlines.
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*
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* Example usage:
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* const str = dedent`
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* {
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* test
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* }
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* `;
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* str === "{\n test\n}\n";
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*/
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export default function dedent(
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strings: $ReadOnlyArray<string>,
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...values: $ReadOnlyArray<string>
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): string {
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let str = '';
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for (let i = 0; i < strings.length; ++i) {
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str += strings[i];
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if (i < values.length) {
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str += values[i]; // interpolation
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}
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}
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const trimmedStr = str
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.replace(/^\n*/m, '') // remove leading newline
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.replace(/[ \t]*$/, ''); // remove trailing spaces and tabs
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// fixes indentation by removing leading spaces and tabs from each line
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let indent = '';
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for (const char of trimmedStr) {
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if (char !== ' ' && char !== '\t') {
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break;
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}
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indent += char;
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}
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return trimmedStr.replace(RegExp('^' + indent, 'mg'), ''); // remove indent
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}
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