flow like the river

BACK_BACK/node_modules/postcss-normalize-positions/LICENSE-MIT

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+Copyright (c) Ben Briggs <beneb.info@gmail.com> (http://beneb.info)
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation
+files (the "Software"), to deal in the Software without
+restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.

BACK_BACK/node_modules/postcss-normalize-positions/README.md

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+# [postcss][postcss]-normalize-positions
+
+> Normalize positions with PostCSS.
+
+## Install
+
+With [npm](https://npmjs.org/package/postcss-normalize-positions) do:
+
+```
+npm install postcss-normalize-positions --save
+```
+
+## Example
+
+### Input
+
+```css
+div {
+    background-position: bottom left;
+}
+```
+
+### Output
+
+```css
+div {
+    background-position:0 100%;
+}
+``` 
+
+## Usage
+
+See the [PostCSS documentation](https://github.com/postcss/postcss#usage) for
+examples for your environment.
+
+## Contributors
+
+See [CONTRIBUTORS.md](https://github.com/cssnano/cssnano/blob/master/CONTRIBUTORS.md).
+
+## License
+
+MIT © [Ben Briggs](http://beneb.info)
+
+[postcss]: https://github.com/postcss/postcss

BACK_BACK/node_modules/postcss-normalize-positions/dist/index.js

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+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+
+var _postcss = require('postcss');
+
+var _postcssValueParser = require('postcss-value-parser');
+
+var _postcssValueParser2 = _interopRequireDefault(_postcssValueParser);
+
+var _cssnanoUtilGetArguments = require('cssnano-util-get-arguments');
+
+var _cssnanoUtilGetArguments2 = _interopRequireDefault(_cssnanoUtilGetArguments);
+
+var _has = require('has');
+
+var _has2 = _interopRequireDefault(_has);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+const directions = ['top', 'right', 'bottom', 'left', 'center'];
+
+const center = '50%';
+
+const horizontal = {
+    right: '100%',
+    left: '0'
+};
+
+const vertical = {
+    bottom: '100%',
+    top: '0'
+};
+
+function transform(value) {
+    const parsed = (0, _postcssValueParser2.default)(value);
+    const args = (0, _cssnanoUtilGetArguments2.default)(parsed);
+    const relevant = [];
+
+    args.forEach(arg => {
+        relevant.push({
+            start: null,
+            end: null
+        });
+
+        arg.forEach((part, index) => {
+            const isPosition = ~directions.indexOf(part.value.toLowerCase()) || (0, _postcssValueParser.unit)(part.value);
+            const len = relevant.length - 1;
+
+            if (relevant[len].start === null && isPosition) {
+                relevant[len].start = index;
+                relevant[len].end = index;
+
+                return;
+            }
+
+            if (relevant[len].start !== null) {
+                if (part.type === 'space') {
+                    return;
+                } else if (isPosition) {
+                    relevant[len].end = index;
+
+                    return;
+                }
+
+                return;
+            }
+        });
+    });
+
+    relevant.forEach((range, index) => {
+        if (range.start === null) {
+            return;
+        }
+
+        const position = args[index].slice(range.start, range.end + 1);
+
+        if (position.length > 3) {
+            return;
+        }
+
+        const firstValue = position[0].value.toLowerCase();
+        const secondValue = position[2] && position[2].value ? position[2].value.toLowerCase() : null;
+
+        if (position.length === 1 || secondValue === 'center') {
+            if (secondValue) {
+                position[2].value = position[1].value = '';
+            }
+
+            const map = Object.assign({}, horizontal, {
+                center
+            });
+
+            if ((0, _has2.default)(map, firstValue)) {
+                position[0].value = map[firstValue];
+            }
+
+            return;
+        }
+
+        if (firstValue === 'center' && ~directions.indexOf(secondValue)) {
+            position[0].value = position[1].value = '';
+
+            if ((0, _has2.default)(horizontal, secondValue)) {
+                position[2].value = horizontal[secondValue];
+            }
+
+            return;
+        }
+
+        if ((0, _has2.default)(horizontal, firstValue) && (0, _has2.default)(vertical, secondValue)) {
+            position[0].value = horizontal[firstValue];
+            position[2].value = vertical[secondValue];
+
+            return;
+        } else if ((0, _has2.default)(vertical, firstValue) && (0, _has2.default)(horizontal, secondValue)) {
+            position[0].value = horizontal[secondValue];
+            position[2].value = vertical[firstValue];
+
+            return;
+        }
+    });
+
+    return parsed.toString();
+}
+
+exports.default = (0, _postcss.plugin)('postcss-normalize-positions', () => {
+    return css => {
+        const cache = {};
+
+        css.walkDecls(/^(background(-position)?|(-webkit-)?perspective-origin)$/i, decl => {
+            const value = decl.value;
+
+            if (cache[value]) {
+                decl.value = cache[value];
+
+                return;
+            }
+
+            const result = transform(value);
+
+            decl.value = result;
+            cache[value] = result;
+        });
+    };
+});
+module.exports = exports['default'];

BACK_BACK/node_modules/postcss-normalize-positions/package.json

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+{
+  "name": "postcss-normalize-positions",
+  "version": "4.0.2",
+  "description": "Normalize keyword values for position into length values.",
+  "main": "dist/index.js",
+  "files": [
+    "dist",
+    "LICENSE-MIT"
+  ],
+  "scripts": {
+    "prepublish": "cross-env BABEL_ENV=publish babel src --out-dir dist --ignore /__tests__/"
+  },
+  "keywords": [
+    "css",
+    "postcss",
+    "postcss-plugin"
+  ],
+  "license": "MIT",
+  "devDependencies": {
+    "babel-cli": "^6.0.0",
+    "cross-env": "^5.0.0"
+  },
+  "homepage": "https://github.com/cssnano/cssnano",
+  "author": {
+    "name": "Ben Briggs",
+    "email": "beneb.info@gmail.com",
+    "url": "http://beneb.info"
+  },
+  "repository": "cssnano/cssnano",
+  "dependencies": {
+    "cssnano-util-get-arguments": "^4.0.0",
+    "has": "^1.0.0",
+    "postcss": "^7.0.0",
+    "postcss-value-parser": "^3.0.0"
+  },
+  "bugs": {
+    "url": "https://github.com/cssnano/cssnano/issues"
+  },
+  "engines": {
+    "node": ">=6.9.0"
+  }
+}