estree-toolkit
Version:
Traverser, scope tracker, and more tools for working with ESTree AST
55 lines (54 loc) • 2.06 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.cleanObj = exports.toCamelCase = exports.assertNever = void 0;
/**
* Causes a compiler error if a switch is not exhaustive
* or you can say causes a compiler error if all possible switch cases
* are not covered
*
* This function would never get called in reality, if your code is correct
*/
/* istanbul ignore next */
const assertNever = (x) => x;
exports.assertNever = assertNever;
/**
* These codes are from https://github.com/blakeembrey/change-case, and is licensed under the MIT License.
*/
const SPLIT_LOWER_UPPER_RE = /([\p{Ll}\d])(\p{Lu})/gu;
const SPLIT_UPPER_UPPER_RE = /(\p{Lu})([\p{Lu}][\p{Ll}])/gu;
const SPLIT_REPLACE_VALUE = '$1\0$2';
const DEFAULT_STRIP_REGEXP = /[^\p{L}\d]+/giu;
/* istanbul ignore next */
const split = (input) => {
let output = input.trim();
output = output
.replace(SPLIT_LOWER_UPPER_RE, SPLIT_REPLACE_VALUE)
.replace(SPLIT_UPPER_UPPER_RE, SPLIT_REPLACE_VALUE);
output = output.replace(DEFAULT_STRIP_REGEXP, '\0');
let start = 0;
let end = output.length;
// Trim the delimiter from around the output string.
while (output.charAt(start) === '\0')
start++;
if (start === end)
return [];
while (output.charAt(end - 1) === '\0')
end--;
return output.slice(start, end).split(/\0/g);
};
const toCamelCase = (input) => {
const transform = (word, index) => {
const char0 = word[0];
const initial = index > 0 && char0 >= '0' && char0 <= '9' ? '_' + char0 : char0.toLocaleUpperCase();
return initial + word.slice(1).toLocaleLowerCase();
};
const words = split(input);
const output = words
.map((word, index) => (index === 0 ? word.toLocaleLowerCase() : transform(word, index)))
.join('');
return output;
};
exports.toCamelCase = toCamelCase;
/** Creates a clean object that doesn't have any prototype */
const cleanObj = (obj) => Object.assign(Object.create(null), obj);
exports.cleanObj = cleanObj;