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index.ts
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index.ts
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import wildcard from "wildcard";
import mergeWith from "./merge-with";
import joinArrays from "./join-arrays";
import unique from "./unique";
import { CustomizeRule, ICustomizeOptions, Key } from "./types";
import { isPlainObject } from "./utils";
function merge<Configuration extends object>(
firstConfiguration: Configuration | Configuration[],
...configurations: Configuration[]
): Configuration {
return mergeWithCustomize<Configuration>({})(
firstConfiguration,
...configurations
);
}
function mergeWithCustomize<Configuration extends object>(
options: ICustomizeOptions
) {
return function mergeWithOptions(
firstConfiguration: Configuration | Configuration[],
...configurations: Configuration[]
): Configuration {
// No configuration at all
if (!firstConfiguration) {
return {} as Configuration;
}
// @ts-ignore
if (firstConfiguration.then) {
throw new TypeError("Promises are not supported");
}
if (configurations.length === 0) {
if (Array.isArray(firstConfiguration)) {
// Empty array
if (firstConfiguration.length === 0) {
return {} as Configuration;
}
// @ts-ignore
if (firstConfiguration[0].then) {
throw new TypeError("Promises are not supported");
}
return mergeWith(
firstConfiguration,
joinArrays(options)
) as Configuration;
}
return firstConfiguration;
}
return mergeWith(
[firstConfiguration].concat(configurations),
joinArrays(options)
) as Configuration;
};
}
function customizeArray(rules: { [s: string]: CustomizeRule }) {
return (a: any, b: any, key: Key) => {
const matchedRule =
Object.keys(rules).find(rule => wildcard(rule, key)) || "";
if (matchedRule) {
switch (rules[matchedRule]) {
case CustomizeRule.Prepend:
return [...b, ...a];
case CustomizeRule.Replace:
return b;
case CustomizeRule.Append:
default:
return [...a, ...b];
}
}
};
}
type Rules = { [s: string]: CustomizeRule | Rules };
function mergeWithRules(rules: Rules) {
return mergeWithCustomize({
customizeArray: (a: any, b: any, key: Key) => {
let currentRule: CustomizeRule | Rules = rules;
key.split(".").forEach(k => {
currentRule = currentRule[k];
});
if (isPlainObject(currentRule)) {
return mergeWithRule({ currentRule, a, b });
}
return [];
}
});
}
const isArray = Array.isArray;
function mergeWithRule({
currentRule,
a,
b
}: {
currentRule: CustomizeRule | Rules;
a: any;
b: any;
}) {
if (!isArray(a)) {
return a;
}
const bAllMatches: any[] = [];
const ret = a.map(ao => {
if (!isPlainObject(currentRule)) {
return ao;
}
const ret = {};
const rulesToMatch: string[] = [];
const operations = {};
Object.entries(currentRule).forEach(([k, v]) => {
if (v === CustomizeRule.Match) {
rulesToMatch.push(k);
} else {
operations[k] = v;
}
});
const bMatches = b.filter(o => {
const matches = rulesToMatch.every(
rule => ao[rule]?.toString() === o[rule]?.toString()
);
if (matches) {
bAllMatches.push(o);
}
return matches;
});
Object.entries(ao).forEach(([k, v]) => {
const rule = currentRule;
switch (currentRule[k]) {
case CustomizeRule.Match:
ret[k] = v;
Object.entries(rule).forEach(([k, v]) => {
if (v === CustomizeRule.Replace && bMatches.length > 0) {
const val = last(bMatches)[k];
if (typeof val !== "undefined") {
ret[k] = val;
}
}
});
break;
case CustomizeRule.Append:
ret[k] =
bMatches.length > 0
? (v as Array<any>).concat(last(bMatches)[k])
: v;
break;
case CustomizeRule.Prepend:
ret[k] = bMatches.length > 0 ? last(bMatches)[k].concat(v) : v;
break;
case CustomizeRule.Replace:
ret[k] = bMatches.length > 0 ? last(bMatches)[k] : v;
break;
default:
const currentRule = operations[k];
// Use .flat(); starting from Node 12
const b = bMatches
.map(o => o[k])
.reduce(
(acc, val) =>
isArray(acc) && isArray(val) ? [...acc, ...val] : acc,
[]
);
ret[k] = mergeWithRule({ currentRule, a: v, b });
break;
}
});
return ret;
});
return ret.concat(b.filter(o => !bAllMatches.includes(o)));
}
function last(arr) {
return arr[arr.length - 1];
}
function customizeObject(rules: { [s: string]: CustomizeRule }) {
return (a: any, b: any, key: Key) => {
switch (rules[key]) {
case CustomizeRule.Prepend:
return mergeWith([b, a], joinArrays());
case CustomizeRule.Replace:
return b;
case CustomizeRule.Append:
return mergeWith([a, b], joinArrays());
}
};
}
export {
customizeArray,
customizeObject,
CustomizeRule,
merge,
// This will show up as .default in CommonJS but for TS it's backwards-compatible
merge as default,
mergeWithCustomize,
mergeWithRules,
unique
};