@nodescript/stdlib/out/nodes/Flow.Loop.js

Standard Node Definitions

export const module = {
    version: '0.2.0',
    moduleName: 'Flow / Loop',
    description: 'Executes a subgraph in a loop. The subgraph decides whether to continue iterating or not and what result to return.',
    keywords: ['while'],
    params: {
        limit: {
            schema: {
                type: 'number',
                default: 10,
            },
        },
        scope: {
            schema: {
                type: 'object',
                properties: {},
                additionalProperties: { type: 'any' },
            }
        },
    },
    result: {
        async: true,
        schema: {
            type: 'any',
        },
    },
    subgraph: {
        input: {},
        output: {
            type: 'object',
            properties: {
                resume: { type: 'boolean' },
                result: { type: 'any' },
            },
            additionalProperties: { type: 'any' },
        },
    },
};
export const compute = async (params, ctx, subgraph) => {
    const { limit } = params;
    let iteration = 0;
    const scope = { ...params.scope };
    while (iteration < limit) {
        iteration += 1;
        const { resume, result, ...newScope } = await subgraph({
            ...scope,
        }, ctx.newScope());
        if (!resume) {
            return result;
        }
        Object.assign(scope, newScope);
    }
    throw new LoopLimitError('Loop limit exceeded');
};
class LoopLimitError extends Error {
    constructor() {
        super(...arguments);
        this.name = this.constructor.name;
    }
}