### Installing js-pptx via npm

Source: https://github.com/won21kr/js-pptx/blob/master/README.md

Instructions on how to install the js-pptx library using the npm package manager for Node.js projects. This command fetches the library directly from its GitHub repository.

```shell
npm install protobi/js-pptx
```

--------------------------------

### Running js-pptx Tests

Source: https://github.com/won21kr/js-pptx/blob/master/README.md

Command to execute the unit tests defined for the js-pptx library using npm scripts. Requires project dependencies to be installed.

```shell
npm test
```

--------------------------------

### Creating and Saving PPTX with Shapes and Charts (Javascript)

Source: https://github.com/won21kr/js-pptx/blob/master/README.md

Provides a comprehensive Node.js example showing how to load a template PPTX, add new slides with specified layouts, add various shapes (triangles, ellipses, random ellipses), modify an existing shape, add a chart with sample data, and save the final presentation to a new file.

```javascript
"use strict";

var fs = require("fs");
var PPTX = require('..');


var INFILE = './test/files/minimal.pptx'; // a blank PPTX file with my layouts, themes, masters.
var OUTFILE = '/tmp/example.pptx';

fs.readFile(INFILE, function (err, data) {
  if (err) throw err;
  var pptx = new PPTX.Presentation();
  pptx.load(data, function (err) {
    var slide1 = pptx.getSlide('slide1');

    var slide2 = pptx.addSlide("slideLayout3"); // section divider
    var slide3 = pptx.addSlide("slideLayout6"); // title only


    var triangle = slide1.addShape()
        .text("Triangle")
        .shapeProperties()
        .x(PPTX.emu.inch(2))
        .y(PPTX.emu.inch(2))
        .cx(PPTX.emu.inch(2))
        .cy(PPTX.emu.inch(2))
        .prstGeom('triangle');

    var triangle = slide1.addShape()
        .text("Ellipse")
        .shapeProperties()
        .x(PPTX.emu.inch(4))
        .y(PPTX.emu.inch(4))
        .cx(PPTX.emu.inch(2))
        .cy(PPTX.emu.inch(1))
        .prstGeom('ellipse');

    for (var i = 0; i < 20; i++) {
      slide2.addShape()
          .text("" + i)
          .shapeProperties()
          .x(PPTX.emu.inch((Math.random() * 10)))
          .y(PPTX.emu.inch((Math.random() * 6)))
          .cx(PPTX.emu.inch(1))
          .cy(PPTX.emu.inch(1))
          .prstGeom('ellipse');
    }

    slide1.getShapes()[3]
        .text("Now it's a trapezoid")
        .shapeProperties()
        .x(PPTX.emu.inch(1))
        .y(PPTX.emu.inch(1))
        .cx(PPTX.emu.inch(2))
        .cy(PPTX.emu.inch(0.75))
        .prstGeom('trapezoid');

    var chart = slide3.addChart(barChart, function (err, chart) {

      fs.writeFile(OUTFILE, pptx.toBuffer(), function (err) {
        if (err) throw err;
        console.log("open " + OUTFILE)
      });
    });
  });
});

var barChart = {
  title: 'Sample bar chart',
  renderType: 'bar',
  data: [
    {
      name: 'Series 1',
      labels: ['Category 1', 'Category 2', 'Category 3', 'Category 4'],
      values: [4.3, 2.5, 3.5, 4.5]
    },
    {
      name: 'Series 2',
      labels: ['Category 1', 'Category 2', 'Category 3', 'Category 4'],
      values: [2.4, 4.4, 1.8, 2.8]
    },
    {
      name: 'Series 3',
      labels: ['Category 1', 'Category 2', 'Category 3', 'Category 4'],
      values: [2.0, 2.0, 3.0, 5.0]
    }
  ]
}
```

--------------------------------

### Running All Development Commands

Source: https://github.com/won21kr/js-pptx/blob/master/README.md

Command to execute a sequence of standard development commands (potentially including build, test, minify, etc.) for the js-pptx project via a single npm script.

```shell
npm run all
```

--------------------------------

### Building js-pptx Project

Source: https://github.com/won21kr/js-pptx/blob/master/README.md

Command to build the js-pptx project files using npm scripts. This typically involves compilation or processing steps defined in the package.json.

```shell
npm run build
```

--------------------------------

### Minifying js-pptx Build Output

Source: https://github.com/won21kr/js-pptx/blob/master/README.md

Command to minify the built files of the js-pptx project using npm scripts. This step is usually performed to reduce file size for production deployments.

```shell
npm run minify
```

--------------------------------

### Including js-pptx Script Tag (Browser)

Source: https://github.com/won21kr/js-pptx/blob/master/README.md

Shows the intended way to include the js-pptx library in a browser environment using a standard script tag. Note that this browser functionality is explicitly marked as 'Not yet implemented' in the current version.

```html
<script src="js-pptx.js"></script>
```

--------------------------------

### Modifying Existing Shape Properties (Javascript)

Source: https://github.com/won21kr/js-pptx/blob/master/README.md

Demonstrates how to load an existing PPTX file, retrieve a specific slide and shape by its index (assuming 'slide1' exists), and modify its text content and geometric properties (position, size, shape type) using the fluent API.

```javascript
var PPTX = require('../lib/pptx');
var fs = require('fs');

var INFILE = './test/files/parts3.pptx';
var OUTFILE = './test/files/parts3-a.pptx';

fs.readFile(INFILE, function (err, data) {
  if (err) throw err;

  var pptx = new PPTX.Presentation();
  pptx.load(data, function (err) {

    var slide1 = pptx.getSlide('slide1');
    var shapes = slide1.getShapes();

    var shapes = slide1.getShapes()
    shapes[3]
        .text("Now it's a trapezoid")
        .shapeProperties()
        .x(PPTX.emu.inch(1))
        .y(PPTX.emu.inch(1))
        .cx(PPTX.emu.inch(2))
        .cy(PPTX.emu.inch(0.75))
        .prstGeom('trapezoid');
    });
  });
});
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.