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/**
 * Gets the index associated with `key` in the backing array, if it is already present.
 */
let get;
/**
 * Puts `key` into the backing array, if it is not already present. Returns
 * the index of the `key` in the backing array.
 */
let put;
/**
 * Pops the last added item out of the SetArray.
 */
let pop;
/**
 * SetArray acts like a `Set` (allowing only one occurrence of a string `key`), but provides the
 * index of the `key` in the backing array.
 *
 * This is designed to allow synchronizing a second array with the contents of the backing array,
 * like how in a sourcemap `sourcesContent[i]` is the source content associated with `source[i]`,
 * and there are never duplicates.
 */
class SetArray {
    constructor() {
        this._indexes = { __proto__: null };
        this.array = [];
    }
}
(() => {
    get = (strarr, key) => strarr._indexes[key];
    put = (strarr, key) => {
        // The key may or may not be present. If it is present, it's a number.
        const index = get(strarr, key);
        if (index !== undefined)
            return index;
        const { array, _indexes: indexes } = strarr;
        return (indexes[key] = array.push(key) - 1);
    };
    pop = (strarr) => {
        const { array, _indexes: indexes } = strarr;
        if (array.length === 0)
            return;
        const last = array.pop();
        indexes[last] = undefined;
    };
})();

export { SetArray, get, pop, put };
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