@trivago/prettier-plugin-sort-imports/lib/src/utils/assemble-updated-code.js

A prettier plugins to sort imports in provided RegEx order

/**
 * Assembles the updated file, removing imports from the original file and
 * injecting the sorted imports at the appropriate location.
 *
 * @param code the whole file as text
 * @param nodes to be removed
 * @param injectedCode the generated import source to be injected
 * @param injectIdx the index at which to inject the generated source
 */
export const assembleUpdatedCode = (code, nodes, injectedCode, injectIdx = 0) => {
    const ranges = nodes.filter((node) => {
        const start = Number(node.start);
        const end = Number(node.end);
        return Number.isSafeInteger(start) && Number.isSafeInteger(end);
    });
    if (injectedCode !== undefined) {
        ranges.push({
            type: 'InjectedCode',
            start: injectIdx,
            end: injectIdx,
        });
    }
    ranges.sort((a, b) => a.start - b.start);
    let result = '';
    let idx = 0;
    for (const { type, start, end } of ranges) {
        if (start > idx) {
            result += code.slice(idx, start);
            idx = start;
        }
        if (injectedCode !== undefined && type === 'InjectedCode') {
            result += injectedCode;
        }
        if (end > idx) {
            idx = end;
        }
    }
    if (idx < code.length) {
        result += code.slice(idx);
    }
    return result;
};