diff --git a/prosemirror-transform/index.d.ts b/prosemirror-transform/index.d.ts
new file mode 100644
index 0000000000..2082648a79
--- /dev/null
+++ b/prosemirror-transform/index.d.ts
@@ -0,0 +1,120 @@
+// Type definitions for prosemirror-transform 0.18.0
+// Project: https://github.com/ProseMirror/prosemirror-transform
+// Definitions by: David Hahn <https://github.com/davidka>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+
+import { ProsemirrorNode } from 'prosemirror-model'
+import { Mark } from 'prosemirror-model'
+import { MarkType } from 'prosemirror-model'
+import { Slice } from 'prosemirror-model'
+import { Fragment } from 'prosemirror-model'
+import { NodeRange } from 'prosemirror-model'
+import { NodeType } from 'prosemirror-model'
+import { Schema } from 'prosemirror-model'
+
+declare module "prosemirror-transform" {
+  export interface Mappable {
+    map(pos: number, assoc?: number): number
+    mapResult(pos: number, assoc?: number): MapResult
+
+  }
+  export class MapResult {
+    pos: number;
+    deleted: boolean;
+
+  }
+  export class StepMap {
+    constructor(ranges: number[])
+    mapResult(pos: number, assoc?: number): MapResult
+    map(pos: number, assoc?: number): number
+    forEach(f: (oldStart: number, oldEnd: number, newStart: number, newEnd: number) => void): void
+    invert(): StepMap
+
+  }
+  export class Mapping {
+    constructor(maps?: StepMap[])
+    maps: StepMap[];
+    from: number;
+    to: number;
+    slice(from?: number, to?: number): Mapping
+    appendMap(map: StepMap, mirrors?: number): void
+    appendMapping(mapping: Mapping): void
+    appendMappingInverted(mapping: Mapping): void
+    map(pos: number, assoc?: number): number
+    mapResult(pos: number, assoc?: number): MapResult
+
+  }
+  export class Transform {
+    constructor(doc: ProsemirrorNode)
+    addMark(from: number, to: number, mark: Mark): Transform
+    removeMark(from: number, to: number, mark?: Mark | MarkType): Transform
+    clearMarkup(from: number, to: number): Transform
+    replaceRange(from: number, to: number, slice: Slice): Transform
+    replaceRangeWith(from: number, to: number, node: ProsemirrorNode): Transform
+    deleteRange(from: number, to: number): Transform
+    delete(from: number, to: number): Transform
+    replace(from: number, to?: number, slice?: Slice): Transform
+    replaceWith(from: number, to: number, content: Fragment | ProsemirrorNode | ProsemirrorNode[]): Transform
+    insert(pos: number, content: Fragment | ProsemirrorNode | ProsemirrorNode[]): Transform
+    lift(range: NodeRange, target: number): Transform
+    wrap(range: NodeRange, wrappers: { type: NodeType, attrs?: Object }[]): Transform
+    setBlockType(from: number, to: number |  void, type: NodeType, attrs?: Object): Transform
+    setNodeType(pos: number, type?: NodeType, attrs?: Object, marks?: Mark[]): Transform
+    split(pos: number, depth?: number, typesAfter?: { type: NodeType, attrs?: Object }[]): Transform
+    join(pos: number, depth?: number, p1?: boolean): Transform
+    doc: ProsemirrorNode;
+    steps: Step[];
+    docs: ProsemirrorNode[];
+    mapping: Mapping;
+    before: ProsemirrorNode;
+    step(step: Step): Transform
+    maybeStep(step: Step): StepResult
+    docChanged: boolean;
+
+  }
+  export class AddMarkStep extends Step {
+    constructor(from: number, to: number, mark: Mark)
+
+  }
+  export class RemoveMarkStep extends Step {
+    constructor(from: number, to: number, mark: Mark)
+
+  }
+  export function replaceStep(doc: ProsemirrorNode, from: number, to?: number, slice?: Slice): Step
+  export class ReplaceStep extends Step {
+    constructor(from: number, to: number, slice: Slice, structure?: boolean)
+
+  }
+  export class ReplaceAroundStep extends Step {
+    constructor(from: number, to: number, gapFrom: number, gapTo: number, slice: Slice, insert: number, structure?: boolean)
+
+  }
+  export class Step {
+    apply(doc: ProsemirrorNode): StepResult
+    getMap(): StepMap
+    invert(doc: ProsemirrorNode): Step
+    map(mapping: Mappable): Step
+    merge(other: Step): Step
+    offset(n: number): Step
+    toJSON(): Object
+    static fromJSON(schema: Schema, json: Object): Step
+    static jsonID(id: string, stepClass: Step): void
+
+  }
+  export class StepResult {
+    doc?: ProsemirrorNode;
+    failed?: string;
+    static ok(doc: ProsemirrorNode): StepResult
+    static fail(message: string): StepResult
+    static fromReplace(doc: ProsemirrorNode, from: number, to: number, slice: Slice): StepResult
+
+  }
+  export function liftTarget(range: NodeRange): number
+  export function findWrapping(range: NodeRange, nodeType: NodeType, attrs?: Object): { type: NodeType, attrs?: Object }[]
+  export function canSplit(doc: ProsemirrorNode, pos: number, depth?: { type: NodeType, attrs?: Object }[]): boolean
+  export function canJoin(doc: ProsemirrorNode, pos: number): boolean
+  export function joinPoint(doc: ProsemirrorNode, pos: number, dir?: number): number
+  export function insertPoint(doc: ProsemirrorNode, pos: number, nodeType: NodeType, attrs?: Object): number
+
+}
\ No newline at end of file
diff --git a/prosemirror-transform/prosemirror-transform-tests.ts b/prosemirror-transform/prosemirror-transform-tests.ts
new file mode 100644
index 0000000000..3db8edbb8d
--- /dev/null
+++ b/prosemirror-transform/prosemirror-transform-tests.ts
@@ -0,0 +1,3 @@
+import * as transform from 'prosemirror-transform';
+
+let stepmap = new transform.StepMap([]);
diff --git a/prosemirror-transform/tsconfig.json b/prosemirror-transform/tsconfig.json
new file mode 100644
index 0000000000..2526e2d213
--- /dev/null
+++ b/prosemirror-transform/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "prosemirror-transform-tests.ts"
+    ]
+}
\ No newline at end of file