<p dir="auto">… because <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="151760275" data-permission-text="Title is private" data-url="https://github.com/nodejs/node/issues/6456" data-hovercard-type="issue" data-hovercard-url="/nodejs/node/issues/6456/hovercard" href="https://github.com/nodejs/node/issues/6456">nodejs/node#6456</a>, I'd wager.</p>
<p dir="auto">See also: <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="108540747" data-permission-text="Title is private" data-url="https://github.com/microsoft/TypeScript/issues/4990" data-hovercard-type="pull_request" data-hovercard-url="/microsoft/TypeScript/pull/4990/hovercard" href="https://github.com/microsoft/TypeScript/pull/4990">#4990</a></p>
<p dir="auto"><strong>TypeScript Version:</strong> 1.8.10</p>
<p dir="auto"><strong>Code</strong></p>
<p dir="auto"><code class="notranslate">tsc --help</code></p>
<p dir="auto"><strong>Expected behavior:</strong></p>
<p dir="auto">See full help text, ending:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content=" -w, --watch                         Watch input files.
 @&lt;file&gt;                             Insert command line options and files from a file."><pre class="notranslate"><code class="notranslate"> -w, --watch                         Watch input files.
 @&lt;file&gt;                             Insert command line options and files from a file.
</code></pre></div>
<p dir="auto"><strong>Actual behavior:</strong></p>
<p dir="auto">See partial help text, ending:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content=" --init                              Initializes a TypeScript project and creates a tsconfig.json file.
 --jsx KIND                          Specify JSX code generation: 'preserve' or 'reg"><pre class="notranslate"><code class="notranslate"> --init                              Initializes a TypeScript project and creates a tsconfig.json file.
 --jsx KIND                          Specify JSX code generation: 'preserve' or 'reg
</code></pre></div>
<p dir="auto">I am on Mac OS X 10.11.5 with node-js v6.2.2 and typescript 1.8.10. Typescript compiler tsc truncates its help message:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="$ tsc
Version 1.8.10
Syntax:   tsc [options] [file ...]

Examples: tsc hello.ts
          tsc --out file.js file.ts
          tsc @args.txt

Options:
 --allowJs                           Allow javascript files to be compiled.
 --allowSyntheticDefaultImports      Allow default imports from modules with no default export. This does not affect code emit, just typechecking.
 --allowUnreachableCode              Do not report errors on unreachable code.
 --allowUnusedLabels                 Do not report errors on unused labels.
 -d, --declaration                   Generates corresponding '.d.ts' file.
 --experimentalDecorators            Enables experimental support for ES7 decorators.
 --forceConsistentCasingInFileNames  Disallow inconsistently-cased references to the same file.
 -h, --help                          Print this message.
 --init                              Initializes a TypeScript project and creates a tsconfig.json file.
 --jsx KIND                          Specify JSX code generation: 'preserve' or 're$"><pre class="notranslate"><code class="notranslate">$ tsc
Version 1.8.10
Syntax:   tsc [options] [file ...]

Examples: tsc hello.ts
          tsc --out file.js file.ts
          tsc @args.txt

Options:
 --allowJs                           Allow javascript files to be compiled.
 --allowSyntheticDefaultImports      Allow default imports from modules with no default export. This does not affect code emit, just typechecking.
 --allowUnreachableCode              Do not report errors on unreachable code.
 --allowUnusedLabels                 Do not report errors on unused labels.
 -d, --declaration                   Generates corresponding '.d.ts' file.
 --experimentalDecorators            Enables experimental support for ES7 decorators.
 --forceConsistentCasingInFileNames  Disallow inconsistently-cased references to the same file.
 -h, --help                          Print this message.
 --init                              Initializes a TypeScript project and creates a tsconfig.json file.
 --jsx KIND                          Specify JSX code generation: 'preserve' or 're$
</code></pre></div>
<p dir="auto">Note that 'react' word got clipped and shell prompt is returned on the same line.</p>