Add options to allow duplicates or force imports

Author: jonathantneal

.tape.js

@@ -15,14 +15,17 @@ module.exports = {
 				browsers: 'last 1 versions'
 			}
 		},
-		'insertion': {
-			message: 'supports an insertion point'
-		},
 		'insertion-after': {
 			message: 'support an insertion point (at the end of the file)'
 		},
 		'insertion-duplicate': {
 			message: 'removes duplicate insertion points'
+		},
+		'option-force-import': {
+			message: 'forces an import at the beginning of the file',
+			options: {
+				forceImport: true
+			}
 		}
 	}
 };

index.js

@@ -37,7 +37,14 @@ module.exports = postcss.plugin('postcss-normalize', (opts) => {
 		root.walkAtRules(
 			'import-normalize',
 			(atrule) => {
-				if (appliedRules[0].parent) {
+				if (opts && opts.allowDuplicates) {
+					// use any insertion point
+					atrule.replaceWith(
+						appliedRules.map(
+							(rule) => rule.clone()
+						)
+					);
+				} else if (appliedRules[0].parent) {
 					// remove duplicate insertions
 					atrule.remove();
 				} else {
@@ -47,7 +54,7 @@ module.exports = postcss.plugin('postcss-normalize', (opts) => {
 			}
 		);
 
-		if (!appliedRules[0].parent) {
+		if (opts && opts.forceImport && !appliedRules[0].parent) {
 			// prepend required normalize rules
 			root.prepend(appliedRules);
 		}

test/basic.css

@@ -1,3 +1,5 @@
+@import-normalize;
+
 body {
 	font-family: sans-serif;
 }

test/basic.expect.css

@@ -3,85 +3,104 @@ html {
 	-ms-text-size-adjust: 100%;
 	-webkit-text-size-adjust: 100%;
 }
+
 h1 {
 	font-size: 2em;
 	margin: 0.67em 0;
 }
+
 hr {
 	box-sizing: content-box;
 	height: 0;
 	overflow: visible;
 }
+
 main {
 	display: block;
 }
+
 pre {
 	font-family: monospace, monospace;
 	font-size: 1em;
 }
+
 a {
 	background-color: transparent;
 	-webkit-text-decoration-skip: objects;
 }
+
 abbr[title] {
 	text-decoration: underline;
 	text-decoration: underline dotted;
 }
+
 b,
 strong {
 	font-weight: bolder;
 }
+
 code,
 kbd,
 samp {
 	font-family: monospace, monospace;
 	font-size: 1em;
 }
+
 small {
 	font-size: 80%;
 }
+
 img {
 	border-style: none;
 }
+
 svg:not(:root) {
 	overflow: hidden;
 }
+
 button,
 input,
 optgroup,
 select,
 textarea {
 	margin: 0;
 }
+
 button {
 	overflow: visible;
 	text-transform: none;
 }
+
 button,
 [type="button"],
 [type="reset"],
 [type="submit"] {
 	-webkit-appearance: button;
 }
+
 button::-moz-focus-inner,
 [type="button"]::-moz-focus-inner,
 [type="reset"]::-moz-focus-inner,
 [type="submit"]::-moz-focus-inner {
 	border-style: none;
 	padding: 0;
 }
+
 button:-moz-focusring,
 [type="button"]:-moz-focusring,
 [type="reset"]:-moz-focusring,
 [type="submit"]:-moz-focusring {
 	outline: 1px dotted ButtonText;
 }
+
 fieldset {
 	padding: 0.35em 0.75em 0.625em;
 }
+
 input {
 	overflow: visible;
 }
+
 legend {
 	box-sizing: border-box;
 	color: inherit;
@@ -90,49 +109,62 @@ legend {
 	padding: 0;
 	white-space: normal;
 }
+
 progress {
 	display: inline-block;
 	vertical-align: baseline;
 }
+
 select {
 	text-transform: none;
 }
+
 textarea {
 	overflow: auto;
 }
+
 [type="checkbox"],
 [type="radio"] {
 	box-sizing: border-box;
 	padding: 0;
 }
+
 [type="number"]::-webkit-inner-spin-button,
 [type="number"]::-webkit-outer-spin-button {
 	height: auto;
 }
+
 [type="search"] {
 	-webkit-appearance: textfield;
 	outline-offset: -2px;
 }
+
 [type="search"]::-webkit-search-cancel-button,
 [type="search"]::-webkit-search-decoration {
 	-webkit-appearance: none;
 }
+
 ::-webkit-file-upload-button {
 	-webkit-appearance: button;
 	font: inherit;
 }
+
 details {
 	display: block;
 }
+
 summary {
 	display: list-item;
 }
+
 template {
 	display: none;
 }
+
 [hidden] {
 	display: none;
 }
+
 body {
 	font-family: sans-serif;
 }

test/basic.last-1.expect.css

@@ -3,81 +3,99 @@ html {
 	-ms-text-size-adjust: 100%;
 	-webkit-text-size-adjust: 100%;
 }
+
 h1 {
 	font-size: 2em;
 	margin: 0.67em 0;
 }
+
 hr {
 	box-sizing: content-box;
 	height: 0;
 	overflow: visible;
 }
+
 main {
 	display: block;
 }
+
 pre {
 	font-family: monospace, monospace;
 	font-size: 1em;
 }
+
 a {
 	-webkit-text-decoration-skip: objects;
 }
+
 abbr[title] {
 	text-decoration: underline;
 	text-decoration: underline dotted;
 }
+
 b,
 strong {
 	font-weight: bolder;
 }
+
 code,
 kbd,
 samp {
 	font-family: monospace, monospace;
 	font-size: 1em;
 }
+
 small {
 	font-size: 80%;
 }
+
 svg:not(:root) {
 	overflow: hidden;
 }
+
 button,
 input,
 optgroup,
 select,
 textarea {
 	margin: 0;
 }
+
 button {
 	overflow: visible;
 	text-transform: none;
 }
+
 button,
 [type="button"],
 [type="reset"],
 [type="submit"] {
 	-webkit-appearance: button;
 }
+
 button::-moz-focus-inner,
 [type="button"]::-moz-focus-inner,
 [type="reset"]::-moz-focus-inner,
 [type="submit"]::-moz-focus-inner {
 	border-style: none;
 	padding: 0;
 }
+
 button:-moz-focusring,
 [type="button"]:-moz-focusring,
 [type="reset"]:-moz-focusring,
 [type="submit"]:-moz-focusring {
 	outline: 1px dotted ButtonText;
 }
+
 fieldset {
 	padding: 0.35em 0.75em 0.625em;
 }
+
 input {
 	overflow: visible;
 }
+
 legend {
 	box-sizing: border-box;
 	color: inherit;
@@ -86,41 +104,52 @@ legend {
 	padding: 0;
 	white-space: normal;
 }
+
 progress {
 	display: inline-block;
 	vertical-align: baseline;
 }
+
 select {
 	text-transform: none;
 }
+
 textarea {
 	overflow: auto;
 }
+
 [type="number"]::-webkit-inner-spin-button,
 [type="number"]::-webkit-outer-spin-button {
 	height: auto;
 }
+
 [type="search"] {
 	-webkit-appearance: textfield;
 	outline-offset: -2px;
 }
+
 [type="search"]::-webkit-search-cancel-button,
 [type="search"]::-webkit-search-decoration {
 	-webkit-appearance: none;
 }
+
 ::-webkit-file-upload-button {
 	-webkit-appearance: button;
 	font: inherit;
 }
+
 details {
 	display: block;
 }
+
 summary {
 	display: list-item;
 }
+
 template {
 	display: none;
 }
+
 body {
 	font-family: sans-serif;
 }