@netlify/config/lib/validate/helpers.js

Netlify config module

import isPlainObj from 'is-plain-obj';
export const isArrayOfObjects = function (value) {
    return Array.isArray(value) && value.every(isPlainObj);
};
export const isArrayOfStrings = function (value) {
    return Array.isArray(value) && value.every(isString);
};
export const isString = function (value) {
    return typeof value === 'string';
};
// Check an object valid properties, including legacy ones
export const validProperties = function (propNames, legacyPropNames) {
    return {
        check: (value) => checkValidProperty(value, [...propNames, ...legacyPropNames]),
        message: `has unknown properties. Valid properties are:
${propNames.map((propName) => `  - ${propName}`).join('\n')}`,
    };
};
const checkValidProperty = function (value, propNames) {
    return Object.keys(value).every((propName) => propNames.includes(propName));
};
export const functionsDirectoryCheck = {
    formatInvalid: ({ functionsDirectory } = {}) => ({ functions: { directory: functionsDirectory } }),
    propertyName: 'functions.directory',
};