dynamodb-toolbox/dist/esm/transformers/pipe.js

Lightweight and type-safe query builder for DynamoDB and TypeScript.

import { isSerializableTransformer } from './utils.js';
const composeLeft = (left, right) => arg => right(left(arg));
const composeRight = (left, right) => arg => left(right(arg));
const identity = arg => arg;
export class Pipe {
    constructor(transformers) {
        this.transformerId = 'pipe';
        this.transformers = transformers;
        this.encode = this.transformers
            .map(transformer => (arg) => transformer.encode(arg))
            .reduce(composeLeft, identity);
        this.decode = this.transformers
            .map(transformer => (arg) => transformer.decode(arg))
            .reduce(composeRight, identity);
    }
    pipe(transformer) {
        return pipe(...this.transformers, transformer);
    }
}
export class SerializablePipe extends Pipe {
    constructor(transformers) {
        super(transformers);
    }
    toJSON() {
        return {
            transformerId: this.transformerId,
            transformers: this.transformers.map(transformer => transformer.toJSON())
        };
    }
}
export const pipe = (...transformers) => (transformers.every(isSerializableTransformer)
    ? new SerializablePipe(transformers)
    : new Pipe(transformers));