diff --git a/types/lockfile-lint-api/index.d.ts b/types/lockfile-lint-api/index.d.ts
new file mode 100644
index 0000000000..43a9221f47
--- /dev/null
+++ b/types/lockfile-lint-api/index.d.ts
@@ -0,0 +1,73 @@
+// Type definitions for lockfile-lint-api 5.1
+// Project: https://github.com/lirantal/lockfile-lint/tree/master/packages/lockfile-lint-api
+// Definitions by: Markus Lasermann <https://github.com/snaptags>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.9
+
+export type Hosts = ReadonlyArray<string>;
+
+export interface PackageMetadata {
+    version: string;
+    resolved?: string;
+    dependencies?: Record<string, string>; // e.g. {'balanced-match': '^1.0.0', 'concat-map': '0.0.1'}
+}
+
+export type Packages = Record<string, PackageMetadata>;
+
+export interface ValidationOptions {
+    emptyHostname?: boolean;
+}
+
+export interface Error {
+    message: string;
+    package: string;
+}
+
+export interface ValidationError {
+    type: 'error';
+    errors: Error[];
+}
+
+export interface ValidationSuccess {
+    type: 'success';
+    object: Packages;
+}
+
+export type ValidationResult = ValidationError | ValidationSuccess;
+
+export class ValidateHost {
+    constructor(packages: { packages: Packages });
+    validate(hosts: Hosts, options?: ValidationOptions): ValidationResult;
+    validateSingle(packageName: string, hosts: Hosts): boolean;
+}
+
+export class ValidateHttps {
+    constructor(packages: { packages: Packages });
+    validate(): ValidationResult;
+}
+
+export class ValidateScheme {
+    constructor(packages: { packages: Packages });
+    validate(schemes: ReadonlyArray<string>): ValidationResult;
+}
+
+export class ValidateUrl {
+    constructor(packages: { packages: Packages });
+    validate(allowedUrls: ReadonlyArray<string>, options?: ValidationOptions): ValidationResult;
+    validateSingle(packageName: string, allowedUrls: Hosts): boolean;
+}
+
+export interface ParseLockfileOptions {
+    lockfilePath: string;
+    lockfileType: string;
+}
+
+export interface ParseLockfileResult {
+    type: 'success';
+    object: Packages;
+}
+
+export class ParseLockfile {
+    constructor(options: ParseLockfileOptions);
+    parseSync(): ParseLockfileResult;
+}
diff --git a/types/lockfile-lint-api/lockfile-lint-api-tests.ts b/types/lockfile-lint-api/lockfile-lint-api-tests.ts
new file mode 100644
index 0000000000..f6b69a00e4
--- /dev/null
+++ b/types/lockfile-lint-api/lockfile-lint-api-tests.ts
@@ -0,0 +1,85 @@
+import { ValidateHost, ValidateHttps, ValidateScheme, ValidateUrl, ParseLockfile } from 'lockfile-lint-api';
+
+const validator = new ValidateHost({ packages: { name: { version: 'v1.0.0' } } });
+let result;
+try {
+    result = validator.validate(['npm', 'meow']);
+} catch (error) {
+    // something bad happened during validation and the validation
+    // process couldn't take place
+}
+console.log('✔ ValidateHost', result);
+
+const yarnLockfilePath = './yarn.test.lock';
+const options = {
+    lockfilePath: yarnLockfilePath,
+    lockfileType: 'yarn',
+};
+
+// instantiate a new parser with options object
+const parser = new ParseLockfile(options);
+
+// read the file synchronously and parse it
+// providing an object that is compatible
+// with the @yarn/lockfile library which has
+// all the packages listed in `lockfile.object`
+const lockfile = parser.parseSync();
+console.log('✔ parseSync', lockfile);
+
+// now instantiate a validator object with those
+// list of packages
+const hostValidator = new ValidateHost({ packages: lockfile.object });
+let hostResult;
+try {
+    // validation is synchronous and is being called
+    // with 'npm' as a shortcut for the npm registry
+    // host to validate all lockfile resources are
+    // whitelisted to the npm host
+    hostResult = hostValidator.validate(['npm']);
+} catch (error) {
+    // couldn't process the validation
+}
+
+// in this case we expect the validation to fail because
+// we validate a yarnpkg lock file for the npm registry
+if (hostResult?.type === 'success') {
+    console.log('✔ ValidateHost', hostResult);
+} else {
+    console.log('X ValidateHost', hostResult);
+}
+
+const hostValidatorSingle = new ValidateHost({ packages: lockfile.object });
+hostResult = hostValidatorSingle.validateSingle('@types/node@^9.6.5', ['npm']);
+console.log('✔ validateSingle', hostResult);
+
+const httpsValidator = new ValidateHttps({ packages: lockfile.object });
+let httpsResult;
+try {
+    httpsResult = httpsValidator.validate();
+} catch (error) {
+    // couldn't process the validation
+}
+console.log('✔ ValidateHttps', httpsResult);
+
+const schemeValidator = new ValidateScheme({ packages: lockfile.object });
+let schemeResult;
+try {
+    schemeResult = schemeValidator.validate(['git']);
+} catch (error) {
+    // couldn't process the validation
+}
+console.log('X ValidateScheme', schemeResult);
+
+const urlValidator = new ValidateUrl({ packages: lockfile.object });
+let urlResult;
+let urlSingleResult;
+try {
+    urlResult = urlValidator.validate(['git']);
+    urlSingleResult = urlValidator.validateSingle('@types/node@^9.6.5', [
+        'https://registry.yarnpkg.com/@types/node/-/node-9.6.5.tgz#ee700810fdf49ac1c399fc5980b7559b3e5a381d',
+    ]);
+} catch (error) {
+    // couldn't process the validation
+}
+console.log('X ValidateUrl', urlResult);
+console.log('✔ ValidateUrlSingle', urlSingleResult);
diff --git a/types/lockfile-lint-api/tsconfig.json b/types/lockfile-lint-api/tsconfig.json
new file mode 100644
index 0000000000..b097e2efa6
--- /dev/null
+++ b/types/lockfile-lint-api/tsconfig.json
@@ -0,0 +1,25 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "dom",
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "jsx": "react",
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "lockfile-lint-api-tests.ts"
+    ]
+}
diff --git a/types/lockfile-lint-api/tslint.json b/types/lockfile-lint-api/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/lockfile-lint-api/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }