Add @carbon/layout

types/carbon__layout/carbon__layout-tests.ts

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+import {
+    rem,
+    em,
+    px,
+    breakpoint,
+    breakpoints,
+    breakpointDown,
+    breakpointUp,
+    baseFontSize
+} from "@carbon/layout";
+
+const firstBreakpoint = Object.keys(breakpoints)[0];
+
+rem(baseFontSize); // $ExpectType string
+em(baseFontSize); // $ExpectType string
+px(baseFontSize); // $ExpectType string
+
+breakpoint(firstBreakpoint); // $ExpectType string
+breakpointUp(firstBreakpoint); // $ExpectType string
+breakpointDown(firstBreakpoint); // $ExpectType string

types/carbon__layout/index.d.ts

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+// Type definitions for @carbon/layout 0.0
+// Project: https://github.com/IBM/carbon-elements/tree/master/packages/layout
+// Definitions by: Vince Picone <https://github.com/vpicone>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export const baseFontSize: number;
+
+export const breakpoints: {
+    lg: {
+        columns: number;
+        margin: string;
+        width: string;
+    };
+    max: {
+        columns: number;
+        margin: string;
+        width: string;
+    };
+    md: {
+        columns: number;
+        margin: string;
+        width: string;
+    };
+    sm: {
+        columns: number;
+        margin: string;
+        width: string;
+    };
+    xlg: {
+        columns: number;
+        margin: string;
+        width: string;
+    };
+};
+
+export const miniUnit: number;
+
+export const spacing: number[];
+
+export function breakpoint(...args: any[]): string;
+
+export function breakpointDown(name: string): string;
+
+export function breakpointUp(name: string): string;
+
+export function em(px: number): string;
+
+export function miniUnits(count: number): string;
+
+export function px(value: number): string;
+
+export function rem(px: number): string;
+
+export namespace breakpoint {
+    const prototype: {};
+}
+
+export namespace breakpointDown {
+    const prototype: {};
+}
+
+export namespace breakpointUp {
+    const prototype: {};
+}
+
+export namespace em {
+    const prototype: {};
+}
+
+export namespace miniUnits {
+    const prototype: {};
+}
+
+export namespace px {
+    const prototype: {};
+}
+
+export namespace rem {
+    const prototype: {};
+}

types/carbon__layout/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": ["es6"],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": ["../"],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "paths": {
+            "@carbon/layout": ["carbon__layout"]
+        }
+    },
+    "files": ["index.d.ts", "carbon__layout-tests.ts"]
+}

types/carbon__layout/tslint.json

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+{ "extends": "dtslint/dt.json" }