@nerdware/ddb-single-table/dist/esm/Expressions/UpdateExpression/buildAttrPathTokens.js

A schema-based DynamoDB modeling tool, high-level API, and type-generator built to supercharge single-table designs!⚡

/**
 * Given a `fieldPath` like `['foo', 'bar', 0]`, returns:
 *   - `namePath`:   `"#foo.#bar[0]"`
 *   - `valueToken`: `":foo_bar_i0"`
 *
 * Also populates `ExpressionAttributeNames` for each string segment.
 */
export const buildAttrPathTokens = (fieldPath, ExpressionAttributeNames) => {
    let namePath = "";
    const valueParts = [];
    for (const segment of fieldPath) {
        if (typeof segment === "number") {
            namePath += `[${segment}]`;
            valueParts.push(`i${segment}`);
        }
        else {
            const token = `#${segment}`;
            namePath += namePath ? `.${token}` : token; // only add a dot if not the first segment
            valueParts.push(segment);
            ExpressionAttributeNames[token] = segment;
        }
    }
    return {
        namePath,
        valueToken: valueParts.length > 0 ? `:${valueParts.join("_")}` : "",
    };
};