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Fix typos in overview.md #698

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Fix typos in overview.md #698

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6 changes: 3 additions & 3 deletions docs/compiler/overview.md
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# Compiler
The TypeScript compiler source is located under the [`src/compiler`](https://github.com/Microsoft/TypeScript/tree/master/src/compiler) folder.

It is split into the follow key parts:
It is split into the following key parts:
* Scanner (`scanner.ts`)
* Parser (`parser.ts`)
* Binder (`binder.ts`)
* Checker (`checker.ts`)
* Emitter (`emitter.ts`)

Each of these get their own unique files in the source. These parts will be explained later on in this chapter.
Each of these has its own unique files in the source. These parts will be explained later on in this chapter.

## Syntax vs. Semantics
Just because something is *syntactically* correct doesn't mean it is *semantically* correct. Consider the following piece of TypeScript code which although *syntactically* valid is *semantically* wrong
Expand Down Expand Up @@ -53,7 +53,7 @@ There are a few additional files in the TypeScript compiler that provide utiliti
* `let objectAllocator: ObjectAllocator` : is a variable defined as a singleton global. It provides the definitions for `getNodeConstructor` (Nodes are covered when we look at `parser` / `AST`), `getSymbolConstructor` (Symbols are covered in `binder`), `getTypeConstructor` (Types are covered in `checker`), `getSignatureConstructor` (Signatures are the index, call and construct signatures).

## File: Key Data Structures
`types.ts` contains key data structures and interfaces uses throughout the compiler. Here is a sampling of a few key ones:
`types.ts` contains key data structures and interfaces used throughout the compiler. Here is a sampling of a few key ones:
* `SyntaxKind`
The AST node type is identified by the `SyntaxKind` enum.
* `TypeChecker`
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