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Superdiff provides a complete and readable diff for both arrays and objects. Plus, it supports stream and file inputs for handling large datasets efficiently, is battle-tested, has zero dependencies, and is super fast.
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superdiff/test/list-diff.test.ts

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import { getListDiff } from "../src/list-diff";
describe("getListDiff", () => {
it("returns an empty diff if no lists are provided", () => {
expect(getListDiff(null, null)).toStrictEqual({
type: "list",
status: "equal",
diff: [],
});
});
it("consider previous list as completely deleted if no next list is provided", () => {
expect(
getListDiff(["mbappe", "mendes", "verratti", "ruiz"], null)
).toStrictEqual({
type: "list",
status: "deleted",
diff: [
{
value: "mbappe",
prevIndex: 0,
newIndex: null,
indexDiff: null,
status: "deleted",
},
{
value: "mendes",
prevIndex: 1,
newIndex: null,
indexDiff: null,
status: "deleted",
},
{
value: "verratti",
prevIndex: 2,
newIndex: null,
indexDiff: null,
status: "deleted",
},
{
value: "ruiz",
prevIndex: 3,
newIndex: null,
indexDiff: null,
status: "deleted",
},
],
});
});
it("consider next list as completely added if no previous list is provided", () => {
expect(
getListDiff(null, ["mbappe", "mendes", "verratti", "ruiz"])
).toStrictEqual({
type: "list",
status: "added",
diff: [
{
value: "mbappe",
prevIndex: null,
newIndex: 0,
indexDiff: null,
status: "added",
},
{
value: "mendes",
prevIndex: null,
newIndex: 1,
indexDiff: null,
status: "added",
},
{
value: "verratti",
prevIndex: null,
newIndex: 2,
indexDiff: null,
status: "added",
},
{
value: "ruiz",
prevIndex: null,
newIndex: 3,
indexDiff: null,
status: "added",
},
],
});
});
it("detects changes between string lists", () => {
expect(
getListDiff(
["mbappe", "mendes", "verratti", "ruiz"],
["mbappe", "messi", "ruiz"]
)
).toStrictEqual({
type: "list",
status: "updated",
diff: [
{
value: "mbappe",
prevIndex: 0,
newIndex: 0,
indexDiff: 0,
status: "equal",
},
{
value: "mendes",
prevIndex: 1,
newIndex: null,
indexDiff: null,
status: "deleted",
},
{
value: "verratti",
prevIndex: 2,
newIndex: null,
indexDiff: null,
status: "deleted",
},
{
value: "messi",
prevIndex: null,
newIndex: 1,
indexDiff: null,
status: "added",
},
{
value: "ruiz",
prevIndex: 3,
newIndex: 2,
indexDiff: -1,
status: "moved",
},
],
});
});
it("detects changes between number lists", () => {
expect(getListDiff([54, 234, 76, 0], [54, 200, 0])).toStrictEqual({
type: "list",
status: "updated",
diff: [
{
value: 54,
prevIndex: 0,
newIndex: 0,
indexDiff: 0,
status: "equal",
},
{
value: 234,
prevIndex: 1,
newIndex: null,
indexDiff: null,
status: "deleted",
},
{
value: 76,
prevIndex: 2,
newIndex: null,
indexDiff: null,
status: "deleted",
},
{
value: 200,
prevIndex: null,
newIndex: 1,
indexDiff: null,
status: "added",
},
{
value: 0,
prevIndex: 3,
newIndex: 2,
indexDiff: -1,
status: "moved",
},
],
});
});
it("detects changes between object lists", () => {
expect(
getListDiff(
[
{ name: "joe", age: 87 },
{ name: "nina", age: 23 },
{ name: "paul", age: 32 },
],
[
{ name: "paul", age: 32 },
{ name: "joe", age: 88 },
{ name: "nina", age: 23 },
]
)
).toStrictEqual({
type: "list",
status: "updated",
diff: [
{
value: { name: "joe", age: 87 },
prevIndex: 0,
newIndex: null,
indexDiff: null,
status: "deleted",
},
{
value: { name: "paul", age: 32 },
prevIndex: 2,
newIndex: 0,
indexDiff: -2,
status: "moved",
},
{
value: { name: "joe", age: 88 },
prevIndex: null,
newIndex: 1,
indexDiff: null,
status: "added",
},
{
value: { name: "nina", age: 23 },
prevIndex: 1,
newIndex: 2,
indexDiff: 1,
status: "moved",
},
],
});
});
it("detects changes between lists containing duplicated values", () => {
expect(
getListDiff(["mbappe", "messi"], ["mbappe", "mbappe", "messi"])
).toStrictEqual({
type: "list",
status: "updated",
diff: [
{
value: "mbappe",
prevIndex: 0,
newIndex: 0,
indexDiff: 0,
status: "equal",
},
{
value: "mbappe",
prevIndex: null,
newIndex: 1,
indexDiff: null,
status: "added",
},
{
value: "messi",
prevIndex: 1,
newIndex: 2,
indexDiff: 1,
status: "moved",
},
],
});
expect(
getListDiff(
["mbappe", "messi", "messi", "mbappe"],
["mbappe", "messi", "messi"]
)
).toStrictEqual({
type: "list",
status: "updated",
diff: [
{
value: "mbappe",
prevIndex: 0,
newIndex: 0,
indexDiff: 0,
status: "equal",
},
{
value: "messi",
prevIndex: 1,
newIndex: 1,
indexDiff: 0,
status: "equal",
},
{
value: "messi",
prevIndex: 2,
newIndex: 2,
indexDiff: 0,
status: "equal",
},
{
value: "mbappe",
prevIndex: 3,
newIndex: null,
indexDiff: null,
status: "deleted",
},
],
});
expect(
getListDiff(
[
false,
true,
true,
undefined,
"hello",
{ name: "joe", age: 88 },
false,
13,
],
[
false,
false,
true,
undefined,
"hello",
{ name: "joe", age: 88 },
false,
{ name: "joe", age: 88 },
]
)
).toStrictEqual({
type: "list",
status: "updated",
diff: [
{
value: false,
prevIndex: 0,
newIndex: 0,
indexDiff: 0,
status: "equal",
},
{
value: false,
prevIndex: 6,
newIndex: 1,
indexDiff: -5,
status: "moved",
},
{
value: true,
prevIndex: 2,
newIndex: null,
indexDiff: null,
status: "deleted",
},
{
value: true,
prevIndex: 1,
newIndex: 2,
indexDiff: 1,
status: "moved",
},
{
value: undefined,
prevIndex: 3,
newIndex: 3,
indexDiff: 0,
status: "equal",
},
{
value: "hello",
prevIndex: 4,
newIndex: 4,
indexDiff: 0,
status: "equal",
},
{
value: { name: "joe", age: 88 },
prevIndex: 5,
newIndex: 5,
indexDiff: 0,
status: "equal",
},
{
value: 13,
prevIndex: 7,
newIndex: null,
indexDiff: null,
status: "deleted",
},
{
value: false,
prevIndex: null,
newIndex: 6,
indexDiff: null,
status: "added",
},
{
value: { name: "joe", age: 88 },
prevIndex: null,
newIndex: 7,
indexDiff: null,
status: "added",
},
],
});
});
it("showOnly added and deleted values", () => {
expect(
getListDiff(
[
false,
true,
true,
undefined,
"hello",
{ name: "joe", age: 88 },
false,
13,
],
[
false,
false,
true,
undefined,
"hello",
{ name: "joe", age: 88 },
false,
{ name: "joe", age: 88 },
],
{ showOnly: ["added", "deleted"] }
)
).toStrictEqual({
type: "list",
status: "updated",
diff: [
{
value: true,
prevIndex: 2,
newIndex: null,
indexDiff: null,
status: "deleted",
},
{
value: 13,
prevIndex: 7,
newIndex: null,
indexDiff: null,
status: "deleted",
},
{
value: false,
prevIndex: null,
newIndex: 6,
indexDiff: null,
status: "added",
},
{
value: { name: "joe", age: 88 },
prevIndex: null,
newIndex: 7,
indexDiff: null,
status: "added",
},
],
});
});
it("returns an empty diff if no property match the required statuses output", () => {
expect(getListDiff(null, null)).toStrictEqual({
type: "list",
status: "equal",
diff: [],
});
expect(
getListDiff(["mbappe", "mendes", "verratti", "ruiz"], null, {
showOnly: ["moved", "updated"],
})
).toStrictEqual({
type: "list",
status: "deleted",
diff: [],
});
});
it("returns all values if their status match the required statuses", () => {
expect(
getListDiff(null, ["mbappe", "mendes", "verratti", "ruiz"], {
showOnly: ["added"],
})
).toStrictEqual({
type: "list",
status: "added",
diff: [
{
value: "mbappe",
prevIndex: null,
newIndex: 0,
indexDiff: null,
status: "added",
},
{
value: "mendes",
prevIndex: null,
newIndex: 1,
indexDiff: null,
status: "added",
},
{
value: "verratti",
prevIndex: null,
newIndex: 2,
indexDiff: null,
status: "added",
},
{
value: "ruiz",
prevIndex: null,
newIndex: 3,
indexDiff: null,
status: "added",
},
],
});
});
it("consider object updated if a reference property is given and this property hasn't changed", () => {
expect(
getListDiff(
[
"hello",
{ id: 37, isCool: true, hobbies: ["golf", "ski"] },
{ id: 38, isCool: false, hobbies: ["football"] },
undefined,
{ id: 8, age: 77 },
{ id: 55, character: { strength: 66 } },
],
[
{ id: 8, age: 77 },
{ id: 37, isCool: false, hobbies: ["golf", "ski"] },
{ id: 38, isCool: false, hobbies: ["football"] },
undefined,
{ id: 99, character: { strength: 69 } },
],
{
referenceProperty: "id",
}
)
).toStrictEqual({
type: "list",
status: "updated",
diff: [
{
value: "hello",
prevIndex: 0,
newIndex: null,
indexDiff: null,
status: "deleted",
},
{
value: { id: 8, age: 77 },
prevIndex: 4,
newIndex: 0,
indexDiff: -4,
status: "moved",
},
{
value: { id: 37, isCool: false, hobbies: ["golf", "ski"] },
prevIndex: 1,
newIndex: 1,
indexDiff: 0,
status: "updated",
},
{
value: { id: 38, isCool: false, hobbies: ["football"] },
prevIndex: 2,
newIndex: 2,
indexDiff: 0,
status: "equal",
},
{
value: undefined,
prevIndex: 3,
newIndex: 3,
indexDiff: 0,
status: "equal",
},
{
value: { id: 55, character: { strength: 66 } },
prevIndex: 5,
newIndex: null,
indexDiff: null,
status: "deleted",
},
{
value: { id: 99, character: { strength: 69 } },
prevIndex: null,
newIndex: 4,
indexDiff: null,
status: "added",
},
],
});
});
it("consider moved values as updated if the considerMoveAsUpdate option is true", () => {
expect(
getListDiff(["mbappe", "messi"], ["mbappe", "mbappe", "messi"], {
considerMoveAsUpdate: true,
})
).toStrictEqual({
type: "list",
status: "updated",
diff: [
{
value: "mbappe",
prevIndex: 0,
newIndex: 0,
indexDiff: 0,
status: "equal",
},
{
value: "mbappe",
prevIndex: null,
newIndex: 1,
indexDiff: null,
status: "added",
},
{
value: "messi",
prevIndex: 1,
newIndex: 2,
indexDiff: 1,
status: "updated",
},
],
});
expect(
getListDiff(
[
"hello",
{ id: 37, isCool: true, hobbies: ["golf", "ski"] },
{ id: 38, isCool: false, hobbies: ["football"] },
undefined,
{ id: 8, age: 77 },
{ id: 55, character: { strength: 66 } },
],
[
{ id: 8, age: 77 },
{ id: 37, isCool: false, hobbies: ["golf", "ski"] },
{ id: 38, isCool: false, hobbies: ["football"] },
undefined,
{ id: 99, character: { strength: 69 } },
],
{
referenceProperty: "id",
considerMoveAsUpdate: true,
}
)
).toStrictEqual({
type: "list",
status: "updated",
diff: [
{
value: "hello",
prevIndex: 0,
newIndex: null,
indexDiff: null,
status: "deleted",
},
{
value: { id: 8, age: 77 },
prevIndex: 4,
newIndex: 0,
indexDiff: -4,
status: "updated",
},
{
value: { id: 37, isCool: false, hobbies: ["golf", "ski"] },
prevIndex: 1,
newIndex: 1,
indexDiff: 0,
status: "updated",
},
{
value: { id: 38, isCool: false, hobbies: ["football"] },
prevIndex: 2,
newIndex: 2,
indexDiff: 0,
status: "equal",
},
{
value: undefined,
prevIndex: 3,
newIndex: 3,
indexDiff: 0,
status: "equal",
},
{
value: { id: 55, character: { strength: 66 } },
prevIndex: 5,
newIndex: null,
indexDiff: null,
status: "deleted",
},
{
value: { id: 99, character: { strength: 69 } },
prevIndex: null,
newIndex: 4,
indexDiff: null,
status: "added",
},
],
});
});
});